I visited Uniun on both a Fri and Sat night. I found the cover to be pricey ($25), but the venue, atmosphere and music make up for the cover charge. It is a large space filled with people who are looking to have a good time. There is some level of pretension but for the most part, the crowd was ready to let their egos go and party. The music on a fri is very electronic/house and on sat it's a little more mainstream with some hip-hop and top 40 hits.