OK, I finally got the issues taken care of with my Berg HT322 and got to run the Shuttle 9.0 through it last night for rehearsal. A few notable things...
1) The sax player helped me carry in my gear last night, and, with my little case containing the Shuttle in his hand, asked, "so where is this new head you've been raving about?" He had a puzzled look on his face when I told him he was holding it in his hand.
2) The same sax player's eyes got huge when I hit the first note and had to reach over to turn it down. The master was at 50%.
3) After two hours of rehearsing at a decent volume, I touched the top of the amp and it was still completely cool to the touch.
4) I didn't think I was going to want the footswitch other than maybe for muting for tuning, but I did end up kicking in the EQ filters a few different times for different sounds and I think I will probably end up ordering one.
5) A volume boost for solos would have been nice.
6) The Shuttle sounds great. First amp I've ever used with my Berg cab that seems to work well at any volume. I may not have to sonically assault the first row anymore to get my tone. And my slapping seems to cut through better.
Tonight I start integrating my AdrenaLinn III into the mix. Things are about to get interesting...