I saw Tool live in 2006 at the Download Festival in the UK and they were excellent. Maynard's interaction with the crowd is unique and not the usual curse filled random abuse that most heavy(ish) bands use.

The only problem that they had there was that they had only just released their new album, and it was obvious that the crowd didn't know their new songs. Still, an amazing performance though.

Would love to see em live again.