What fredster said... I've had a Mesa 50/50 for 10-12 years, and I also have the 3/4 cab w/ a Black Shadow speaker, but my main cab is a Crate V30 1x12 which seems to cut thru the mix better. I use the Mesa cab as a 2nd when I run a bigger rig. Anyway, the 50/50 works real well for me, seems to have just a touch of poweramp breakup when I want it, never had any issues w/ it. The only thing I don't like is the weight... it's not too heavy but by the time it's in a rack w/ other gear, I start to wish I had a roadie ;-)
@mmcm4: have you tried running the Carvin into regular cabs? I've been interested in the DCM, and also the Matrix, to save weight. But only if I like the sound. Gotta love the price of the Carvin, plus at 60-100 watts per channel it won't overload my cabs like I'm afraid the Matrix might.