my god it was amazing. I mean the tool songs are tool songs but what really makes it awesome is the visuals and the performance. The entire stage was white which at points it became one big screen that played their music videos or other amazing visuals. They had a pretty rediculous laser light show, to 10,000 days part 1 where there is thunder and lighting, so with the fog machines and the lasers it made it look like clouds. Really though if there is one thing you do before you die, you must see tool live.
Oh yea, ISIS was pretty good as well, not too many lyrics but a nice metal-ish jam kinda deal. Pretty powerful music.