The first time I went here was in the summer on a weekend afternoon. It was empty. I was one of maybe 3 customers. It was the best.
And then school started again. The patios were so, so packed and I made the mistake of trying to get a drink there instead of going downstairs. It took over 15 minutes to get the bartender's attention, but she was like a drink pouring machine and I was pretty impressed by how quickly she was getting people drinks. And it's college kids, so they don't know what they want and were bickering with her over drink prices (!!!). They're known for their specials, so I guess there was some confusion.
Their space is like a labyrinth. It's huge, so even when it's packed you can still find a spot for a sizeable group. The staff are great and seem used to managing a crowd. It's not quite my taste, at least not when it's crowded, but it's obvious why it's so popular.