I''ve never seem them live despite the fact the played here in Italy many big concerts during the last tours, but this summer I won't miss the Milan date (San Siro, which is a great venue for football but very bad for concerts...)
http://www.worldstadiums.com/stadium...o_meazza.shtml if you want to take alook at the stadium.
The sound here is horrible.

The price are very expensive also here in Italy...44,00 euro for the cheapest and 82,00 for the best seats.