And while the 50 watt amp may have "the sound" that sound is not going to be the same when the amp is stressing trying to keep up with a band
Right. But it may or may not be the case that the amp would be driven to/past that point. What would be helpful is if some of the people with BA112s offered a little more than clicking the poll and said a bit about their situations.
My BG250 basically lives in the trunk of my car. I have up to 3 rehearsals a week. Some weeks back, with one group, I decided to use an amp that had been left behind by the singer's son, rather than carrying the BG250 in and out. The amp just sits there, and while carrying the BG is no big deal, easier is easier. After having taken a pass on using it since April, to some surprise, I found that it was completely satisfactory and got the job done. I've been using it since that night. Up to last night, I had been under the impression that it was a Peavey (I haven't been curious enough and the grill is removed and it has stickers on it - even on the speaker cone).
I took a closer look at it last night, and it turns out that it's a Fender Rumble 50. It's 50 watts with a 12" speaker. This is a fairly controlled volume situation. Two guitars (Fender combos), keys (Roland Cube & PA), and the drummer uses a Pearl Traveler kit (small, shallow shells - a practice or "coffee house" kit). The Rumble is right at the edge of what it can do, but it sounds fine...pretty good, actually. Cranked, it delivers enough bass and doesn't distort or fart out and can be heard with the drums. If this group situation were the single basis of judgement (and the same set up applied to small gigs), then at 50 watts and having a 12" speaker, this amp would be "fine for practice, rehearsals and small gigs."