I've been looking for a super light combo amp since my back needs a little help. I play coffee houses, open mic nights, church and occasional larger gigs. The larger gigs always have PA support, so I don't need much volume. What I DO want is great tone. I'd like the ability to have a warm, vintage tone, but also a clear, uncolored tone. I gave the Markbass CMD 121P combo a try today. I was very impressed. It seemed to be able to give me quite a variety of tones, and it has more than enough power and volume for my needs. I can add an extention speaker to it, and it has an effects loop if I decide I can't live without my Sansamp BDDI. The thing is, I think I might be able to forgo the Sansamp with this Markbass since I seem to be able to get a nice, warm tone for this amp. I has a DI out, too, which is pretty important for me. I'm using a Carvin BRX 112 right now, and it is a great little amp. It's about twice the weight of the Markbass, though. Both amps run around 300 watts at 8 ohms. The Carvin has the advantage of being able to go down to 2 ohms. As I said, though, I don't need much volume, and I want to keep things compact, light and simple. I doubt I'll run an extention speaker on either amp. So with all that being said, talk me out of the Markbass 12" combo if you can.