I went for the draft and the upper levels probably have the better view. My seats in the lower level were partially obstructed by the overhang of the second level.
Words can't do it justice and I can only imagine how much better it would be with a concert/visuals. I was in Vegas a few weeks ago and couldn't quite justify paying $100 a ticket to see the postcards show since my parents didn't seem overly enthused. That and my dad has bouts with vertigo and I've read reports about people having that triggered by the giant screen.