Hi everyone,
As a new poster on this site, I thought I'd share my experience with this very nice amp.
I've had it for 2 months now, and I'm using a Gibson SG with '57 classic humbuckers and an American Strat with Texas special single coil pickups. I should point out that I'm not much of a jazz guitar player YET (that's why I'm here

), but rather a blues and rock sort (off and on for some 30 years+). I'm planning to get an Eastman jazz guitar and will be getting a listen soon to one of them through the amp.
Overall, it's a monster for under a thousand dollars. It's not small for a 20 watt amp and weighs 53 pounds (prompting me to want to put wheels on it). It's quite loud, for 20 watts, with 2 channels. The Master Volume controls are very transparent (as they say) and I'm getting a feel for how nice that is. Overall, for each channel, you have 3 volumes (if you count the one on your guitar). The variety of tones, especially with the Strat, is amazing.
With the Gibson SG, through the lead channel, I'm getting (with just nearly straight up EQ settings) tones that remind me of Duane Allman and, more recently, Derek Trucks. These sorts of overdriven, warm, humbucking tones are easy to get and totally available. The amp doesn't have a wattage cutting device (like some) but doesn't need anything like that because it sounds great at even very low volumes.
With my American Special Strat, the range of tones is mindblowing, especially in the clean channel. I'm continuall finding new ones by tweaking this or that (without any effects units), using different pickups, etc. Also, very cool, is the continually nice experience of the guitar/amp giviing you a tone that is recognizable from this or that famous recording.
Nothing but good things to say about it. I should also point out that the one I have doesn't have a working reverb unit, so I can't comment on that yet. I have one more month before I have to take it back to get a replacement with a working reverb. It's supposed to be nice, based on the reviews.
The other two SE amps, the 30 watt one and the 50 watter, are also available, and for not much extra. They have different power tubes, and sound different. My local Gutar Center has the 30 watt version (I like the 20 quite a bit better). Haven't heard the 50 watt version yet, but it's only 4 1/2 pounds heavier than the 20.
Hope this helps.
Turtle