All right, I'll start.
I was not a all-tube guy previously, I came from an Aguilar 750. So I definitely enjoyed that kind of tone, but I decided to go all the way, since there's nothing I've ever gotten from Roger I was disappointed with. I did previously play an SVT, but that was back in the 70s, with the refrigerator cabinets.
What I was looking for the analog to what I get out of Roger's basses. In other words, I like the Fender tone in basses, but with more modern presence and zing. That's what his basses are, to me. In the two bands I play with the most, I'm playing Cream-like lines and some Motown stuff. I didn't have any interest in copping exactly that old sound; I wanted it updated.
That's pretty much exactly what I've gotten with the SA200. With the Gain up, and with the switch set to Fat, I can get some very traditional, Fender-y kinds of sounds, but with some more modern forays into the modern tone spectrum, which I define as the presence and definition of the upper end.
However, the amp doesn't just have one tone. I find the EQ very tunable, and not only do I use it just to adjust for various rooms (which it does rather well), but also I can really go from a Jack Bruce sound right to a zesty slap, on the occasions when the song demands it.
It can do ultra-clean as well, switch the Fat/Clean switch the other way, turn everything straight up, and you get a nice, extremely articulate sound, great for jazz, and nice for big band or orchestral stuff (I use it that way for the show I'm doing now with my fretless, and it cuts through the entire orchestra with piano string-like definition).
It should also be noted that this thing is LOUD. One of my bands plays at what I consider to be too-loud volumes, the result of the drummer, unfortunately. On several occasions, I have played where everyone went through the front of house except me. The SA200 kept up nicely with two loud guitar players, a singer, and Bam-Bam, the drummer (yes, he was reinforced as well). Matching with the Sadowsky 410 by Bergantino, with its usefully high sensitivity rating is probably the key to that situation.
On the whole, although I had a bad start with a failing power tube when I first got the amp (quickly solved by Roger, of course), I must say that the amp takes me from small jazz trio settings to loud Allman Brothers music with great apomb. I'm not saying it's the last gigging amp I'll ever buy, but it sure might be. It has never failed to have great tone, no matter what setting I put it in, quiet or loud, any genre. Can I ask anything else from an amp?
. Don't worry I'll make sure it goes to a good home 
(I hope ). 
