BTW- to return to the original topic...search the classifieds on Talkbass and you often can find nice used Shuttles.
That's exactly how I got mine.
So far it's my favorite amp I've owned hands down.
(if I recall correctly that list would consist of: early-80s roland cube 60, 80s peavey TNT-130, Randall RB140 or something, GK 200RB, Eden WT500, Eden WT300, Thunderfunk 400, AI Clarus, AI Focus II, AI Focus III, Genz-Benz Shuttle 6.0.)
Not only is it ridiculously loud for something so small (way way louder than the AI Focus III I used to have), the preamp is very easy to use and sounds good with very little tweaking.
The overdrive from pushing the gain hard isn't bad either, works for me anyway.