This is Tool's debut release. It is a good mini album, featuring a hidden track. That said, do not expect it to sound like 'Undertow' or 'Aenima', because it doesn't. It sounds the way it does, not specifically because Tool dramatically changed their musical direction after this release, but because they decided to put their 'punkiest' songs on it. It is direct, loud and lacks the depth and dynamism of their subsequent releases. But that doesn't invalidate it, not by a long shot. These songs are great, and the band still play some of them live, which shows their attitude towards the release. There is a tendency to think of it as the 'other' Tool album, and to file it away under 'completists'. But this album is more than valid in its own right and is a great rock document. If you listen to their other material and then listen to this you will find yourself getting an amazing insight into the workings of 4 minds that are unlike any you are likely to meet in the course of your average day (unless of course your name is Justin Chancellor!).
Don't buy it first, but if you like the other Tool albums, don't be put off by what you read about this one. It rocks and it's hot and it's Tool!