I've seen a quite a few shows here, both comics and musical acts. I'm happy with the venue and definitely prefer it to the stadiums or outdoor pavilions. I love the downtown location as it makes it easy to combine dinner and a show. I'm too cheap to buy drinks at a concert venue, so the location makes it easy to hit up a bar afterwards.
As far as the basics go, the acoustics are fine, security isn't too dickish, and there's a decent amount of bathrooms. I haven't had any problems with the temperature in the venue as others have. The merch area could be better organized though. It always seems like a cluster.
For concerts, I would recommend the GA tickets. They're usually cheaper than the orchestra seats, and it feels like a more initimate experience.