Bianyifang is widely known by locals and a lot of expats and is well thought of. It's not as expensive as a place like Quanjude, which may be why it is favored by a lot of Chinese who are looking for a good meal at a good price rather than fancy marketing to tourists. It's been awhile since I've been to BYF but as I recall it was pretty good. I think I've been to another branch as well in north part of town that was very good. I'd put DaDong and Liqun before either of them, though.