It's much the same as any of the other barbecue places. The House Brew is a fairly boring red, and not worth the €5.80 they charge. I haven't had the other own-label beers.
It's decent fare but as mentioned I'd recommend My Meat Wagon over it (I haven't been to Bison in far too long, can't remember where it stands among the BBQ places).
If you're ever in MMW, get the sausage as a side. It's glorious.