I've seen Rush, Jeff Beck, and Dream Theater. You have to be a God-tier drummer to play with Rush or Beck. Portnoy couldn't even cut it for Avenged Sevenfold. He's a great player, but he's no Peart, Bozzio, or Colaiuta.
Never made it all the way through the last three albums. The modern production where the bass and drums sound programmed kind of ruin it for me. Growing up listening to guys like Lee Kerslake and Randy Castillo make it a real letdown listening to drums an idiot like me could program in 5 minutes...