Hi,
Well this weekend i did get to try out the B200 and B100. My local GC didn't have a BA115 out. Both the B200 and B100 sound really good to me. Im not the best at describing bass tone. This is my first amp and ive been playing for about 7 months. You can get a wide variety of tones using the notch sweep. Crank the gain and you have a nice growl. Sounds classic to me. They are both pretty loud too. I walked out -$250 and a B100. I chose this because it was a bit smaller(the B200 is pretty large) and i don't need something that big. I'm really happy with it.
EDIT: The weight on the B100 is only 50lbs, but its size is kind of awkward (at least for me). The B200 is nearly 70lbs.
Here is a link the the Acoustic site with manuals for each product.