I've seen Tool 2.1 times. Once in 1993 for the Undertow tour and again in 2002 for Lateralus, and .1 for Maynard G. Krebs appearance on the 1993(?) Rage Against the Machine tour..

In all fairness I still have not gotten 10,000 Days, so I'm unfamiliar with that album. However, IMNSHO Tool is a band that has improved greatly with age and experience and is a good band to just go and listen too. The Undertow show kinda sucked and I left the show early to go to a house party instead. For Lateralus, I paid a premium price for good tickets in an arena. However, I actually moved to the back of the arena about halfway through the show just to listen. The "good" seats were too loud and too stage left. I could get center at the back of the areana and not be overwhelmed by volume.

Now is it worth it? That depends. How much do you like Tool? While I liked the Lateralus show, I would not pay to see them again.