10,000 Days is actually probably my least favorite Tool album. It is basically all rehashed material, every song on it sounds like a track from one of their other albums. It is still a pretty good album, though, all things considered.
I am a much bigger fan of their early albums (Opiate, Undertow). If you do some searching on Youtube you can find some sweet videos of them playing clubs back in the early 90's. It's a lot more raw and harder metal than their prying-open-my-third-eye-let's-discover-our-inner-subconscious metal.