Feature:
Very easy to use. It is well layed out - 2 channels, can be blended or separated w/footswitch, used singely or together. You can create some really cool "amp" hybrids. The back panel also has everything one could need for gigs or studio.

Quality:
Duoverb looks great. The exterior is very high quality; nothing looks cheap. This amp is a serious back bustin' Caddillac! I've never been on the road with this amp. However, I've owned and used it for several years...it's been around a bit. Looks like brand new. Quality wise, there is nothing stands out as bad about this amp. It is well designed, and seems to be built like a tank. The outstanding feature of this amp is that it can keep up with anything...it is LOUD!..and it can overpower anything most of the time, if that's what you want to do. Not an amp for the apartment dweller. This bad boy sounds awesome at a gig volume. It's not bad at apartment volume; just sounds a little duller and less "real"..if this is you, get a low wattage tube amp. If you want to go deaf, this is the amp for you.

Value:
I purchased this amp a little more than 2 years ago at a ridiculously low price. I've not seen it sold at the price that I payed anywhere. That being said, this amp is still a great value for prices I've seen listed around the web.

Desirability:
This is very subjective. I love the way this amp looks. High quality retro. Beyond it's looks, the Duoverb is a practical amp that is capable of producing many different sonic textures.

Sound:
Considering the Duoverb is a solid state modeling amp, it sounds incredible. An effective alternative to a tube amp. Only thing is that it is real loud...I mean REAL loud! Not good if you live close to other people.

Ease of Use:
It doesn't get much easier than this amp, especially since this is a Line6 amp. Front panel very retro. Everything is quite obvious.

Support:
I've never needed any support because I've never had any problems.

Overall:
I'll probably keep this amp for a very long time. It does what I want.