Honestly, an ABG is usually useless in a combo situation without getting plugged in, or mic'ed somehow. The problem that I see with a lot of ABGs is that they use piezo undersaddle transducers, and these can be 'quacky.' With good EQ, and a little processing, they can sound wonderful. I used to play ABG in a couple of band and duo situations.
One of the best bass sounds I ever got was my ABG into a SansAmp BDDI (MK I), into a little Fender Princeton amp. Just lovely, and perfect for the music I was playing. I doubt that I'd play it for anything too rocky, but I pull it out occasionally for a cover/few originals band I sometimes play with. It just can't be beat (with some 'sub-bass', reverb, and a minute amount of echo) for "Folsom Prison Blues" (unless I ever get a real bull-fiddle).
A little strip of foam under the strings at the bridge can give you some mean Thump.