Just played 2 heads yesterday- Fender bassman 100T and the GB SL 900. The fender bassman 100 had a FANTASTIC Clean tone on the vintage channel. The OD channel was so-so to my ears got a little too dirty too fast more fuzz than I'd like. Then, I immediately went and tried the GB SL 900 after reading SO much about it. First response completely and utterly underwhelmed, this was thru a BAG End cabinet 15 inch. Turned up the gain expecting it to sound like Ed Friedlands video, not even CLOSE. Really not much OD at all, for this thing to be compared to an SVT, I jsut don't see it. Does it all depend on the cabinet? Guess I will stick with my Aguilar TH 500 for gigs, and buy an ASHDOWN Little Bastard for tube sound for playing at home or save for the Bassman 100T.