This is not only the best cd Orbital ever made, by far, but also a masterpiece of electronica generally, perhaps one of the greatest electronica sets ever. I've had this album over 15 years and I never tire of listening to it. On the strength of this I bought every cd Orbital ever made, but none quite rose to its level (no shame there this was hard to top). This was clearly a distillation of their talent at its height. Sublime work.
Impossible to categorise (other than electronica), as all great music is. This will always be on my top ten lists of greatest albums ever.