Feature:
Its just a bunch of volume knobs and a very nice speaker. I never mess with the other additions like the subwoofer out, or the 'shape' thing. It's nice that they are there, but really this thing is about getting a clear pure sound turned all the way up. If you want to tailor the sound later do that on your mixing board or DAW or whatever.

Quality:
one of my knob covers fell off but you can still twist the little thingy for your volume. Other than that... it has been out in the rain at a wedding, lived in a musty basement, dragged between states, used at all sorts of pickup sessions, and no problems whatsoever.

Value:
you get what you pay for. These are pricey for the wattage they boast, but I would rather have full on volume at level 10 being clear and piercing in a room than have 300 watts that is all muddy when you turn it past 5.

Desirability:
well i bought one. Seemed to me that with the new world of guitar cab simulators, and the need to sing also during practice, i wanted something that can do both. You can't plug anything but a guitar into a dedicated guitar amp. You can plug anything into this. I work with effect emulators, this thing is just here to make them loud. It outblasts my 200w bass amp when I play a good setup on my bass effect into this. It sounds cleaner than my crap halfstack when I use guitar emulators through it. Plus I can sing through it simultaneously and the signals don't cut each other off.

Sound:
I run a vocal mic, a guitar multipedal, and a bass multipedal through it. I can turn it up all the way to compete with a drummer at practice, and it does fine. My vocals are very dry since i'm not running any effects, and my guitar/bass tones come out just as pure as listening to the multieffects on headphones, even at full volume.

Ease of Use:
turn on. turn up.

Support:
i wouldnt know

Overall:
I needed it because I needed some nice clear volume. It has not failed. I don't think I will ever get another guitar amp, since a nice flat eq'd full range keyboard amp does wonders for amp simulators, sounds so much more piercing and clear at high volume. I don't even play keyboard at all I just love the clarity at high volume that a 'keyboard' amp gives. I don't think of it as a 'keyboard amp' I think of it as a loud knob that turns what I hear in headphones while programming effect patches into something loud enough for practice without being muddied.

Feature:
The shape switch gives the amp a boost of great high sound. The mixer is good to use when you want high or low crisp sound.

Quality:
The rugged cabinet cover give this amp a very nice looking and a handle for carrying.

Sound:
It Has really good Bass Sound comes through the speaker but Horn tweeter could be a bit louder. When I'm playing in a big size chruch you barly hear the sound from the amp. The drums drown the sound of the amp out.

Ease of Use:
This amp may be small but its pack alot of power

Feature:
I like the number of channels and eq level adjustments available with this amp. A friend was able to connect his electric guitar and we both played without any noticeable degradation of sound.

Quality:
The only negative thing I've noticed so far was the velcro strap for the electric cord needed some TLC.

Value:
I purchased a B stock item, so the price was less than retail, but compared to other similar amps was higher in price. If it holds up and continues to sound good, it will have been a good investment. Like most other things, you get what you pay for.

Desirability:
The design is somewhat unique compared to other amps and is visually pleasant.

Sound:
I purchased this to use as a monitor for church playing. My keyboard is connected to the PA system and before I got the amp, the sound I heard was weak, distant and delayed. This amp gives me the ability to hear what I'm playing and also ehances the keyboard sound that the PA misses. Good bass sound and good punch when needed. I was originally interested in the KC550, but this does a great job of addressing my current needs. There aren't too many keyboard amps available nearby for me to hear, but this was by far the best sounding.

Ease of Use:
Very easy to set up and use. I like the line out feature for connecting to the PA system.

Overall:
No current plans for another purchase. I'm hoping this will last for quite awhile. I like the sound quality, ease of use and the way it looks. So far, I'm quite pleased with it.

Quality:
Well made, sturdy, I have used and abused it for almost a year now with no problems.

Sound:
Sounds good, I use it with a midi equiped accordion. Nice transparent sound with little or no coloring. More than enough power for what I use it for.

Support:
I emailed Roland a question - they acknowledged receipt but never answered the question. It is advertised as 120 amp but the power label says it consumes 100 watts total power. All amps are less than 100 percent efficient. So how can this be? They still haven't answered.