I have 2 of the Bose S1s and they sound surprisingly good. There are several more detailed threads around about the Bose S1, here and/or over on SynthZone. Up on lightweight speaker stands, they sound quite good. Sitting on a table they sound pretty good too. I have used them for smaller gigs and for rehearsals at a theatre production I was involved with. The batteries last very well - I'd say they get more than the ~6 hours advertised, but when they get below about 50% I charge them "just in case".
They dropped the price *after* I bought mine (of course!) and now include the battery which used to be a $100 USD add-on.
They aren't going to blow the roof off, or thump bass that you feel in your chest - but they have surprisingly good bass and good overall balanced sound, IMHO ..
Jim