I've visited Backstage Bar several times over the years for shows and events. I had a great time at the beer-tasting event they hosted. The staff has been friendly and the prices are on par with other theaters (expensive, but that's on par).
Shows have been hit or miss. I've really liked a few and a few haven't been great. But either way, a night out in a decent theater... I'll take it. There were a few hosted events that took place there as well, and that was a great location to have the mingling and then go into the space for the event. Certainly something to consider if planning a large event.