We were in the market for a good reverb, possibly combined with chorus and a few other effects, and it shouldn't cost an arm and a leg.
The Behringer DSP 2024 gives us all that and much more. Reverb and chorus sound great, the ultrabass and various compressor presets are simply outstanding, and there are a host of other effects that sound like they should be useful. It'll take some time to fully explore this marvel. The dials to control the effects are very handy and easy to use. I much prefer them over the buttons you get on other similar units.
To top it off, this unit is very inexpensive. I am actually toying with the idea of buying a second one.

Feature:
Not skimpy on the features, I haven't really dug into them enough to see how useful they are.

Quality:
Mine was a B-stock and was in perfect shape. Not a bad looking unit, has that trademark Behringer look, though, so if you're a Behringer hater, you'll hate it.

Value:
Compared to other new units, it's the price that will draw you to it (it did me), but you can get used Lexicons online for around this price and will most likely prefer their reverb sound, if reverb is your main reason for buying this.

Desirability:
It's aesthetically like most other Behringer boxes, and its specs are like most rack-mount DSPs.

Sound:
I haven't gotten into the depths of this unit yet and started tweaking, but the 200 presets have a lot of "sameness" about them, and in my rig (using it as an outboard FX for an AW416) they tend to sound very brittle and tinny, unlike the warmth you get with a Lexicon. Certain psychoacoustic FX, like subbass, can add a cool sound to a track or overall mix, but others, like ultrawide, just add an amazing amount of high end.

Overall:
Obviously this unit's selling point is it's price/feature ratio, but unfortunately I'm not all that happy with the sound, which is REALLY the prime consideration in audio, eh? I'll continue to work with it until I find an EQ setting that compliments it, but right out of the box, I rate it about a "7."

I have owned this unit for over three months and as still learning all of the features. Just when I think I've got it another feature raises its head. For instance; You can slave a second amp off the second output. You run the Input/Output through the first amp effects loop, plug your axe into the first amp, then run a second line from the second output of the unit to the effects input of the second amp. Both amps now have access to all of the original effects! I compared it to the Lexicon MPX200 and the Dightech M300 and because of the price/preformance ratio, I went with the Behringer.

Feature:
A lot of great reverb algorithms, and other usefull effects for a very good price. (I put an MPX500 and a DSP2024P on two aux sends with various plate simulations, and challenged a very well know sound engineer to tell me which one was the MPX500 - he couldn't tell the difference)

Quality:
Well constructed, only negative is the MIDI connectors are the less expensive plastic version, and you have to be gentle with them. The 1/4" jacks are very good, Overall solid quality.

Value:
What can I say.... It is extremely good value.

Desirability:
I want it

Sound:
If you have used Lexicon Pro Reverb products, and know how to adjust the various reverb delay options, the bass and treble freq. response characteristics, and signal routing to get the sound you want, you will find this unit does it every bit as well as the best Lexicon unit (most users don't get into this detail). The 24 bit processor is clean and the room simulation algorithms are very accurate and believable. Really nice plate algorithms - as good as the best Lexicon units. The other effects are also usable (especially the amp & speaker simulators, why pay for $50 for other simulators that arn't as good). I found the gate and Compressor/Expander options somewhat below studio pro standard, but usable for live applications.

Support:
I had a question and they answered it immediately. (I had to return a 3282 monitor mixer once, and they mailed a replacement within 3 days)

Overall:
You won't be dissapointed

Feature:
You get plenty of control over the various parameters, and the knobs, with their speed sensitive response, get you to where you want to be pretty quickly - certainly better than increment buttons. The presets are OKish but too many seem to be [literally] there for effect, rather than to provide a useful range of graduated sounds.

Quality:
Similar to other Behringer equipment - solid construction and the controls don't feel cheap and nasty.

Value:
Good value for money, provided you don't expect to get a Porsche for the price of a Ford.

Desirability:
I don't like the 'slanty look' of the latest Behringer stuff, but it works and feels OK so, whilst it lacks sex appeal, it's not particularly naff either.

Sound:
If this is to be your main reverb unit, you may be a little disappointed with the sounds compared to [say] a Lexicon, though it's on a par with most of Zoom's efforts. If price is important, then the reverbs are value for money, shall we say? The other effects - and you get a lot - are generally usable, especially when buried in the mix. The guitar amp emulations are a bit thin for serious use, but may hold up when integrated into a mix. Overall, it's possibly too clinical in what it does, but it does do quite a lot.

Ease of Use:
On a par with other budget equipment, and better than some. Storing user presets is quick and simple. The display is not great if you need a constant readout of each parameter's setting, but, at the price, this seems to be an acceptable alternative to an LCD screen. It takes about 1s to load a new preset once selected, which may be a problem in live situations. Also, it doesn't appear possible to cue a preset and load it when ready - you have to scroll to the preset which then loads itself. The Lexicon 550 is much better in this respect [but still takes about 1s to load the preset].

Overall:
I got this as a secondary studio reverb unit, with the bonus of some useful additional effects, all at a very acceptable asking price. I wouldn't choose this model for live work or gigging, however, as you cannot change seamlessly from one sound to another - the delay would be too intrusive. It's possible to get some nice noises out of it, but you will need to spend time 'playing' in order to achieve the sound you want. A bit more cash will get you a better sounding, but less versatile piece of equipment.

This is one cool unit with a plethora of sounds
including an over 5 second delay!
The reverbs are AWESOME, it also includes Graphic and a Parametric EQ's as well as seperate Bass and Treble functions for each preset.
There's hardly a tone that you CAN'T get with this puppy, and with a 100 *USER* presets at your disposal there's not many that you won't.

I highly recommend it.

Feature:
The number of simultaneous effects is limited. That said, it matches fairly closely what I actually use.

Quality:
Only used at home/studio.

Value:
Great value for money.

Desirability:
It looks out of place in the rack. Doesn't have the same pro look as my other gear. Actually it looks like a toy.

Sound:
Just bought this to replace a dead Quadraverb that I've had for 15 years. Since I used the QV for just a couple of effects for the guitar this seemed like a good choice. It was the cheapest of the bunch (cheaper even than getting a couple of pedals). I was pretty impressed by the sound.

Support:
Not had any reason to.

Overall:
If it lasts as long as the QV I'll be more than happy.

Feature:
very quick to edit, nice display is helpful once you know the unit. some unique patches such as comp/limiter, even. does not allow different efx per channel. really wish it did.

Quality:
now- I know the camps are divided on behringer...I've had my fair share of behringer returns and breakdowns. that said, I use this live, on stage, regularly. It gets kicked, knocked around, hot, cold, etc, and it has been reliable.

Value:
for the $$, I'll buy another if the need arises.

Desirability:
aesthetics. I dislike this category.

Sound:
Pretty darn good, especially for the price. cleaner than older behringer models, less noise than other better brands. Prefered over our yamaha processors. most of the default patches are way overcooked. you have to spend some time to tame them.

Ease of Use:
as far as efx units go, this one edits really quickly.

Support:
no experience.

Overall:
I have no plans to replace/upgrade. great experience with this box.

Feature:
Fairly feature rich the unit has MIDI-In,MIDI-Out,MIDI-Thru for controller from any MIDI unit. Including your sequencer if you know how to set it up properly. Most effects have six to eight parameters to tweak, some even with part delays. The jog wheel is nice, it responds to how fast you're turning it and the scroll speed acts appropriately. It would have been nice to fit all eight knobs to avoid having to switch with a button, although the layout of the unit wouldn't allow for such. And it's just a minor thing, but still. Can store 100 user defined presets. (Unit comes with 200 pre-sets[I001-I100|U001-U100], but you can overwrite the last 200 [U001-U100] with your own settings, for quick recall at a later time.) Two channel, Stereo processing. Or can be input from one channel and switched to MONO mode for stereo effects results. Rackmountable. All LEDs are easily identifiable and readable.

Quality:
Unit seems failry well constructed, at least as well as most Behringer units, it's styled like the rest of their current gear so it dosn't stick out like a sore thumb. Although the MIDI ports on the unit I have are fairly cheap and caution must be taken when inserting or removing cables so as to not damage the ports.

Value:
The unit is definately worth 130 which is what ithink the current rate is, especially for a first effects unit. I've been using it on instruments and vocals and it's very consistant and suits my applicataion needs. Alot of places like GC sell it for 149.99 and I'm not sure it's worth that since for $50 you can start gettting into some of the other units which are more critically acclaimed and battle tested. If you could pick one up for around 99 I think that would be a steal.

Desirability:
I would buy it again all though not sure if I would add it to a more extensive collection of effects units. Would definately buy again on a project basis.

Sound:
Sounds are pretty clean and vary according to control, pretty flexible... the unit can be noisy if pushed to hard, otherwise solid sounds all round.

Support:
Never used their support.

Overall:
I think this unit will stay with me for quite some time if not throughout my audio journeys. It's very decent especially with the two channel stereo processing. I'm going to need another effects unit sometime soon and I probably won't get another one of these unless it's sub one hundred. Looking to get something sweeter for vocals. Allthough this unit can do a decent job with them, there are definately better. Most first timers will be very sastified with this unit.