Dined at Biff's in a party of 10 about a week ago. Atmosphere was lovely, and the staff were extremely attentive, which considering I was the fashionably late last to arrive, was a pleasant surprise.
I enjoyed the steak frites, and the staff were happy to amend things to cater to specific dietary restrictions. Steak was perfectly cooked, and the side of veggies were served with a garnish that I'd guess was a parsley puree of some kind that was out of this world. I'm not really sure if I've guessed right at parsley, but whatever it was, I loved it.
Ambiance was upscale casual and enjoyable. I saw many other options on the menu that I'd be interested in trying again sometime.