My first visit (last week) at Proof was excellent. The Martini Menu is out of sight. The service and food was great. I suggest ordering the Martini Sampler so that you can get a taste of the many varieties offered. I will definitely make this a spot to visit often.
Even though it's not officially a sports bar, this place knows how to treat sports fans. We went there for the Tigers' Opening Day yesterday and I will go back before (and after) every game. Amazing service, very clean bathrooms, and no jacked-up beer prices here. We paid double the price at Cheli's! I've been to a lot of bars downtown and I will always return to Proof.
Can't go wrong when you go to Proof. During the week, it's chill and laid back. On the weekends it's a fun club with really great DJ's, but not too pretentious, ever! BTW, the owners seems to always be there and make a great effort to spend time getting to know their customers. Also a great place to go before/after Tigers' games. Never TOO crowded like the local sports bars.