I've only ever been to Eleven for brunch, but the experience is always wonderful. The service is here is top notch without being stuffy and you really feel pampered, which is a nice change from a lot of other places that try to be upscale, but don't quite follow through with the food. For what you get, I think the prix fixe brunch is worth it. The Bloody Mary here is pretty good, as are the gin cocktails I've tried. My favorite part about brunch is probably the basket of mini breads. The food isn't super unique for brunch - I think we've tried most things on the menu now, but they do a good job. With the solid food, great service, and spaced out tables that make conversation easy, Eleven is easily one of the best choices for a leisurely brunch in Pittsburgh.