Came here in August as saw the Legends of Hip Hop Tour, which was a fun/interesting crowd. Hip hop crosses many generations and cultures so you saw the old school people who were probably the same age as Slick Rick (who rocked it but is probably somebody's grandpa now as he didn't move a whole lot, lol) to younger folks whose parents probably raised them on the music, so they were there out of respect and curiosity. Kinda like how I'd check out the Temptations or Earth Wind and Fire. It was a good sized crowd that night but not so much where people were hot and uncomfortable, so that was good.
I bought the side balcony GA tickets and thought they were pretty good. Since I'm not one to be on the GA floor and being squished anymore (or trying to handshake the performer) I enjoyed being above the crowd and seeing everything. The side GA balcony has pretty good views especially the closer you get to the stage. Because it's GA you do have to get there earlier to score a space at the railing. I like how because you're standing already you can dance and groove as you are. With seats, you have to be courteous of others around you. Can't be standing up the whole time unless everyone else is.
As a lot of people have mentioned, there really is no bad seat in the house and the acoustics/sound was great. It's large enough but small enough. The tickets you buy really depends on how "involved" you'd like to be at your concert. Standing GA is always in the thick of the action and the bouncing/dancing crowd. Seats will get you comfort at a distance and again, the GA up above gives you a little bit of both. The bummers is that if you buy balcony tickets, they will not let you mingle downstairs and vice versa, however there are bars all over this facility so there wasn't any lines for anything, even the bathrooms!
I'd definitely see another concert here again if given the opportunity.