Feature:
there are a wide variety of features that make you sound like a pro

Quality:
the quality of the BOSS RC-20XL is outstanding, I have had my loopstation for a year now and it is in perfect condition, the thing is I use it just about every single day, it still looks and sounds exactly as it did a year ago, nothing has been broken or replaced, and if you think about it, after using it just about every single day and stomping on the pedals with my feet, for it to be in perfect condition is incredible

Value:
you would honestly think that it would be at least a few hundred dollars more, for the enjoyment and pleasure I have recieved from my loopstation, I would pay alot more than what I did, totally worth the money

Desirability:
well, I think it looks pretty hott, the design is simple yet technical at the same time, it's set up beautifully with black pedals,base and buttons,red front panel,white writing,red and green lights, which make it look pretty sexy, plus, i know my loopstation has gotten me some action many times - "Here, let me show you something I wrote for you", works everytime, my reason for not giving it a 10 on "I want it" is because my favorite color is blue

Sound:
the sound quality is amazing, the phrases recorded sound exactly like your amp. without the loopstation, it does not take any sound away from your amp. whether you are recording or not

Overall:
As long as I keep playing guitar (which will be forever), I will be as satisfied as a man could be with using any kind of guitar product, I get the purest form of mental satisfaction/pleasure when using my loopstation, for less than $300.00 it's an outstanding value, the only way I would ever replace my loopstation is if I were to get a newer model, but I will never sell it or give it away, if there ever is a fire in my house, I am grabbing two things, my guitar, and my loopstation, and when I die...my loopstation is coming with me

Feature:
One thing I really wish this unit had was a way to turn off the beat quantizer. This would make it much more useful to me for live applications. Rather than having to worry about setting a tempo for the loop, if you could record for an arbitrary amount of time, then have the unit loop automatically once you stop, it would be better (certain other loop/delay pedals work this way), especially when playing in non-standard time signatures. Also, it has 11 different "patches" into which you can record samples, but the only way to switch between them is a knob. Again, for live performances, this is not very useful, as you have to stop playing, bend down and turn the knob. If there was a way to switch patches with your foot, it would be much, much better.

Quality:
Good quality unit; not indestructable, but certainly sturdy.

Value:
I got this in the hopes of being able to use it both live and for practice. As it turns out, it's only really useful to me as a practice tool. (Sure, I can record things beforehand, save them and use them live, but that's kind of cheap... I'd rather have something that's easy to lay down loops with on the fly.)

Desirability:
It's nothing special to look at.

Sound:
The sound is fine; there are separate knobs for the instrument and sample levels, which is useful.

Support:
No dealings.

Overall:
As a practice tool, this is an extremely useful--and fun--unit. I often have to write both guitar and bass parts for my band, and this has made that process much easier. I can just lay a guitar part down, let it loop, pick up the bass and play until I figure something out. For live uses, though, it's not that useful unless you do some setup beforehand (i.e., record and save the sample before the show, or annoy the audience with the metronome sound while you lay down the loop before you start the song). It's not accurate or intuitive enough to just use on-the-fly without running the risk of some really ugly sounding off-tempo loops. If the tap-tempo feature was improved, and there was a way to switch off the quantizer, this unit would be 10 times more useful for my purposes.