Went to Brennan's tonight with the family, six people in total.
I'll say this: the food was very good, though sort of unremarkable. The tableside thing was nice (our porterhouse steaks were carved that way, and we got the baked Alaska for just that reason), but the Lex & 50th location and the (overly) subdued feel to the place kept the thrill factor down.
I'd go back, I guess. The meat was almost perfect. Sides were so-so. It was good. Not great.