I have a br03-97 (I think it USED to be made in the gen world, but not anymore.. not sure), and the power reserve works just fine.. actually like the rep a lot.
Not sure of its accuracy but i think it's fairly close to the gen.. B&R's aren't that hard to rep anyways. It's a ~21,600bph movement though, so you see a slight stutter in the second hand.
I think most just like the brXX-92 series of reps more.. kinda like rolex.. why are subs/dssd's so much more popular than a yatchmaster...?