Feature:
Classic clean tone, plus a great chorus. The spring reverb is not very useful and the 'distortion' has always been kind of a joke, but who cares? You buy this amp for it's bright clean sound, period. If you want to add overdrive, get a tube screamer or something--although I think those sound better in front of a tube amp. (except if you're using a Pod like me...) Like just about every great piece of gear, the JC120 focuses on doing one thing very well.

Quality:
Seems to work well and take a lot of abuse. Built like a tank.

Value:
Yeah, it's worth it. Definitely.

Desirability:
Let's face it, this amp has a look all its own. If your main concern is lookin cool onstage, get a Marshall stack or tweed Bassman. The JC120 is definitely not "cool". However, I could give a ---- about how it looks as long as the sound is awesome. Most people can't believe I get the sounds I do out of my little setup.

Sound:
The JC120 is an awesome clean amp. Different from a Twin Reverb, but not better or worse. That is why I use it to amplify my PodXt modeler. I played a JC120 at music school in the early 80's and loved it, but then gravitated to the Fender Twin for clean sounds and Hiwatt and MesaBoogie for distorted tones. Now that I use a Pod to model all of those great tube amp/speaker combinations, I needed a combo amp for gigs/rehearsals that would not color the sound of the POD. Lots of people complain about the sound of a Pod through their guitar amp, but if you like what you hear in the headphones, you will like what you hear coming out of the JC120, it's that pristine.

Ease of Use:
Very easy to use and tweak. The EQ is very musical. Makes a great acoustic guitar stage amp, and works well with keyboards, too, although it may not have enough bass response for some synths. I like being able to plug directly into the L & R inputs of the power amp.

Support:
Never needed it.

Overall:
Overall great amp that deserves to be called a classic!

Feature:
you have to wire the three footswitches with their own wire. The amp sounds noticeably different when i use the effect loop. i love running my me-50 through it in true stereo. it also lets you hook up external speaker if you want to hook it up to another jc-120. love the bright channel.

Quality:
great quality. The knobs are perfectly smooth and they are big. The knobs are also recessed so they won't break if my amp ever fell over in the car. The input jacks are smooth and dont even make a sound when i unplug.

Value:
better clean than more expensive amps. best chorus than any amp. Not cheap, but good investment becaus eit will last a long time.

Desirability:
i love the look, the big roland logo and the colored control area are better than plain old black. the girlle is perfect beacuse you can see through it at the two beutifal silver coned speakers. Many people will know what is is from far away because of those two big silver cones.

Sound:
its clean sound makes your guitar sound a lot better than you would think. It sounds so good clean that i use my effects less. chorus is amazing and the vibrato can be sped up for a neat effect. i think the distortion is great. you can hear your dynamics and every note when the distortion is on. its sounds bigger than mono amps because it is stereo. big frequency response. even works well with vocals.

Ease of Use:
makes anyting sound great. i find that when the bright channel is on and i use a lot of distortion from my pedal it sounds different. easy to use. sounds great with acoustic/electric.

Support:
haven't delt with them

Overall:
It is not a tube amp, but that is also a good thing. I wish i could use a midi footcontroler. Can be used for many instruments (guitar, acoustic, acoustic/electric, keyboard, vocals, electronic drums, midi instrumet,....)