First off, A Perfect Circle rocks. I dont much like tool, but I love APC.
Next, Ive never seen one of their shows, but from what Ive heard, they are a little lacking in the live experience. They only have one albums worth of material (but of course, this could have changed. Doubtful, since Tools new album is forthcoming, but possible none the less) and the people I know who have seen it, said it left them a little unsatisfied.