I stopped by BB's a few times on my last trip a few weeks ago (was staying at a villa in Costambar) and had dinner. I was surprised that the food was actually pretty good. I had a funny experience one night, though. My friends had been spending some time with some of the girls (yes, my friends, as the girls were definitely not my type) and one night the older waitress started to laugh as we were eating and then mentioned to me that many of the girls there thought that I was a dominican serving as a driver for the rest of the guys as they noticed I would bring the guys there, and then drive them off with some girls, but didn't have a girl myself. I guess they realized that I wasn't a dominican driver when I picked up the check for dinner one night. We all had a pretty good laugh.
One day I met someone who I thought might have been the owner but, when I asked, he said that he was not. He was a hell of a nice guy, however. He checked on us periodically to ask if everything was going okay.
I won't be staying in Costambar on my next trip, but I will definitely stop in to BB's for dinner and a few Presidentes. I guess it's not a bad place to hang out during the day for a bit if you've got nothing better to do.