Aenima is not just the best Tool album.....it's also one of the best CD's released in the past decade.  It takes everything that made Tool what they were on Undertow and expands it.  This also means adding some flair and showmanship, and this mostly works in the band's favor.  A lot of songs which I consider to be definitive Tool songs are on this CD including "Stinkfist," "46 and 2," and "Third Eye," the requisite 10-minute-plus song.  Others, like "H." and "Eulogy" as well as the title track make this a CD worthy of anyone's collection.  This CD's only real problem in an apparent lack of focus...you may look and see that there are 15 tracks, but in reality, there are 9 true songs. 6 of the tracks are filler.  Some of it, like the track entirely in German, lends a lot to the creepy atmosphere.  Others, like the Ions track, are just total wastes of time.  Yet, all in all, Aenima still stands as the best Tool album, in my opinion.