Touring again!? Very, very cool!
I live in the US, so I won't get to check those particular dates out (fingers crossed for a summer tour in the states!) but they are one of the best live shows I've ever seen in my life.
My first concert was Ozzfest 2002 when I was 14, and Ozzy wasn't at the show I saw (that was when Sharon was diagnosed with cancer) so System of a Down were headlining.
Having never seen a concert at that point, I was completely blown away. Even in retrospect, they put on one of the best shows I've ever seen.