One of my absolute favorite places to dance in Pittsburgh, the DJ's that play here are always spot on with their music. I will say it does get packed in Goldmark so know that going in, that by the time midnight rolls around you will have a hard time navigating around, especially to the bar and to the bathroom, also if you're not in before midnight there will most likely be a line outside.
Aside from those warnings though, it seriously is a great place to dance, just try to get there earlier so you can get in without any lines.