Warm up bands have been 50/50 for me. Conor Oberst, Andrew Bird and Bon Iver have been fantastic. However, seeing Hem in Saratoga, NY was pretty bad. And I have the distinction of seeing Death Holz not once, but twice. At 9:30 some years back, and then on my pilgrimage to Chicago in November 2007. And at that same Chicago show, what was up with the big rabbit coming out to play on a kiddie piano? The two Tweedy acoustic shows I've seen have had GREAT warm up acts! It's been hit or miss.