Feature:
Basic features, but exactly what I wanted. I do have a Yamaha Motif, this board is obviously not comparable in terms of features. But hence, that ain't bad at all, it's a Stage Board and it does what it's supposed too. Set your splits, layers and yer all set! Effects are typical, don't expect mad quality.

Quality:
Board feels solid. Took me a few minutes to get used to the keys, they tend to feel on the heavier side and aren't graded (bass to treble), all feel the same. Looks like this will last, it's thick and solid!

Value:
I picked up a B-stock floor model. No problems at all. Solid and easy to use. Awesome price! Did I mention it includes a sustain pedal? And not the cheap square little ones, this is good quality pedal.

Desirability:
I needed something basic and affordable for now. I do plan to switch to a Nord Stage/Electro in the future. But i'll prolly keep this anyways...Blue lights, yummy! lol

Sound:
I run this through 2.1 monitor set, this board sounds surprisingly great. I bought it for stage and home use and have no complaints. Board has your real basic bread and butter: Piano, EPs, Organs and strings.

Ease of Use:
Simple! Don't even need to read the manual. All the settings are easily labelled.

Support:
No idea, haven't needed it yet (cross fingers). Includes manual, didn't open it lol

Overall:
Awesome purchase. No complaints. First piece of hardware from this company. Good job M-audio!

Feature:
Great Features, great piano sounds! Use for a band with piano and sinigng. Also great string sounds.

Quality:
Great Quality! Sturdy metal frame. Great for gigs!

Value:
Best Value without a doubt on the market!

Desirability:
Amazing, everything you need and more.

Sound:
Amazing sound, very deep and expressive. With headphones on, this keyboard is so powerful that it makes your ears hurt!

Ease of Use:
Very easy, push a button!

Support:
This product is so good, that you will never need to use support, but they are there if you need them.

Overall:
You will not be dissapointed.

Feature:
Sustain pedal that was sturdy and with authentic feel included. 3 independent volume faders for main, layer, and split, complete with bass and treble knobs, pitch bend and mod wheel. Earphone jacks were also really nice. It also doubles as a MIDI controller (Which I am using it more for.) Its feature-packed. BUT Hammer-action style needs a bit of getting used to No stand included No sound producing capabilities (you gotta hook it up to speakers or an amp.)

Quality:
For a sub 1k piano, its really very heavy-duty. It does not require a stand; it has 4 little studs ready to sit on your (long enough) desktop table. Of course, its pretty heavy. Dont try testing its durability by dropping it.

Value:
For a stage piano with these much features and overall ok sounds, its definitely a good buy for the price.

Desirability:
I have a weakness for blue lights. This piano has it for effects and sound buttons. It looks great from any angle. But then again, who cares about how good it looks. Its how its suited to your preferences.

Sound:
Most of you out there would have heard from M-Audio that their piano sounds extremely great. Dead wrong. All the on-board piano sounds are extremely horrible especially in the mid-range. They sound tinged and fake. BUT... Don't forget you get other sounds that comes along with it. And here is where I didnt gripe. The warm pad and strings are really lush and vibrant with added effects. As for the other sounds though (E-piano, Bass, Clavi, etc.), I find nothing too awesome about them.

Ease of Use:
Install the driver, plug in the cables and you are good to go. However I dont really like the control interface. The blinking and numbers can get very confusing at times; especially if you are impatient in changing effects. However, just bear with it for once, set the reverb and chorus to the appropriate values you want and it saves the setting for you. That's where its nice.

Support:
M-Audio has one of the worst customer support. Out of 5 emails Ive sent, only 1 responded. It was a test though. I have no problems with my prokeys. Yet.

Overall:
Considering the way the hammer action keys work, this piano wont last through your whole career. But its really a good, good choice for any budget musician starting out and looking for a hammer action piano. It should keep you happy for at least 2 years.

Feature:
The action is fairly loose, especially compared to the RD700SX that was right next to it. And at first it felt bad to me, but after playing this for a bit, I saw that I could get used to it. Very few sounds, but most of them are excellent.

Quality:
Seems okay, but not that solid.

Value:
For $600, this is an incredible value, and it has just the sounds that a gigging keyboard player needs. I wish it had more onboard effects (a la Nord Electro2), especially for the clav patch. The Roland RD700SX is a better board in every way, but it's over $2000, and the ProKeys 889 has most of what I need.

Desirability:
For the price, it's amazing, and this is the appeal. I wish other manufacturers would price like this!

Sound:
The piano is quite good, and more than acceptable for accompaniment work. I was able to dig in and enjoy. The Rhodes was tasty, the Wurly honked, and the Clav funked. M-Audio chose the right sounds! The organ is okay, too, but without a Leslie sim it is useless to me. The electric bass with cymbal makes for a very fun split.

Overall:
If you can handle a mediocre piano action and limited effects and expandability, and just need *killer* piano, EP, and Clav sounds, this is the axe for you.

Feature:
Came with sustain pedal but also has sostenuto and expression inputs. MIDI clock is really useful and its works well for me as a more than basic controller.

Quality:
Has a nice toned down quality look - good for stage use as well as being attractive enough in the home. Fees solid with everything well made

Value:
Sounds and features CANNOT BE BEATEN at this price - NO WAY!!!!!!!!!!!!!!!

Desirability:
Love it!!

Sound:
Piano's are good, the FR and Whirly are really great. All the required sounds are there - nice set up!!!

Support:
I called them for help setting up the ride cybal and them were really helpful.

Overall:
Would buy another one if this one was stolen - incredible value

Sound:
My goal was to get a good sounding piano without sacrificing an arm and a leg to get it. That is what I got with the M-Audio Pro Keys88 digital Piano, excellent sound. No complaints about the other bells and whistles either.

Support:
Only time will tell.

Feature:
it has some but not all

Quality:
it hardly even breakd when it thought you could do it for someone else.

Value:
i'm very wealthy.

Desirability:
you could always paint it or put stickers on it, but for me it has a simple urban non-genderedness that appeals.

Sound:
This thing scared my puppies! seriously, i think they have trouble sleeping sometimes.

Support:
i dont call outside much anymore. but that isn't there problem anyway.

Overall:
this is good and simple as simon, which means it won't break, ever.