I agree with ANONYMOUS.  The concert was FANTASTIC, but thought the BOK could have done a better job preparing people for the security situation.  Though, I would have waited 10X as long in the cold to see Metallica!  It would be nice to not have to, though.  And I wasn't too impressed with the BOK itself...it was nice, but didn't look or feel like a brand new building.  Did I say that Metallica was amazing?  They were amazing.