Mine works fine for me as an everything solution to my one-man rig -- CP4, SR-18 drum machine, and TC Helicon for vocals. I do need to use a small sub, though, because the SSv3 doesn't have quite enough bottom (for me, anyway) with the drums, even in fairly quiet settings.
I could see it working in a 1 man band setting, but not as a vocal monitor with the amp behind you in a louder band setting.