Not completely unhelpful. :)
Yeah, I think the GEQ is crucial on these amps. They stopped making the non-GEQ versions after a pretty short run. (I think the Express line is discontinued altogether now?) The burn mode has a ton of gain, but after a point it just squishes into an upper-mid band and gets kind of boring. Don't know exactly how to articulate that. Then there's something unpleasant in the upper registers that I can't dial out with the tone stack or contour, even with a boost/ OD in front. (The tone controls are so interactive, as we've all discussed before, and if you put a dirt pedal with interactive controls of its own in the mix, it's easy to get lost.) I actually like the Crunch mode on Channel 1 a little more, but if I use it I sacrifice the Clean mode...
I'm going to run it into a closed back 4x12 this weekend, and if I find something useful, I'll take my chances with that Creamback 10. (The same speaker Mesa is putting in their 10" Mkar Five:25 now.) It's hard enough to get any consistent feedback about speaker replacements, and much more so when you're dealing with an oddball 10" cabinet. But I'd like to make this combo a little more functional. It is a really cool-looking amp, and so portable.
P.S. I also find the Spring reverb on this amp to pretty useless. Again, too much sssssssssssss up top, not a lot of character anywhere else.