Watching Madoka on the big screen really is different. The Kajiura music was 50% more epic, and the art/animation was clearly improved. Also, THAT TRAILER.
The crowd was surprisingly tame, and only about 5 people raised their hands when the Aniplex person asked who hasn't watched Madoka before.
My only regret is arriving too late to buy merchandise. The artboards and wallscrolls were sold out.