I use a Roland AC33 with a TC Helicon VoiceLive Play GTX for busking, small restaurant and lounge gigs. I play solo, and use my own loops and backing tracks sometimes. The volume is plenty for small venues and the sound quality is as good, or maybe a bit better than Bose systems. It weighs almost nothing. I have been very happy with it. And the battery option is a definite plus. I had power go out during a gig twice, and was able to keep playing, The venue was impressed enough that I am still playing there over 1 year later...
Heck, I even play it outside. Check out my video of busking on the Walnut St. Bridge in Chattanooga, Tn. The sound has not been enhanced or altered in any way.
https://youtu.be/7BZ4FlmOODE
I am thinking of ditching my 800-watt PA and getting an AC60, or maybe even the AC 90, for when I need a little more umph on larger gigs. It's a lot more convienint than lugging a PA around, and sounds better.