What a wonderful time my wife and I had at The Butterjoint! We arrived around 6pm on a Friday and had a bit of a wait, but we were greeted promptly and taken care of by the server even though it was standing room only.
Our server Ben was excellent, very attentive even with a big happy hour/dinner crowd, and his compatriot manning the clipboard watched tables like a hawk to turn them over without rushing the folks enjoying their meal.
The food was wonderful. Butterjoint has one of the best burgers in Pittsburgh, made with grass fed and finished local beef. Every day they have a new Fancy Burger that arrives with "Fancy" burned into the bun. So good!
We will return and try to avoid happy hour. The place settled down around 7 when we were there.