Awesome club - definitely up there with Zouk in Singapore/KL and Fabric in London. Only thing is be prepared to wait as they do that stupid line up thing even though it wasnt that full when we first got in. Dont worry though it fills up and the music is great. Music style is mainly Techno, House or Electro. Also, the lasers and the decor are pretty amazing in themselves, for example, the DJ booth is made in the shape of a UFO.
There is also food for those who want however as can be expected this is expensive. Drinks are also on the pricy side.
Best night to go is when Frankfurt have what they call Nacht der Club which is where you can get into a number of venues for only 10 euros. These nights do get busy though and the buses between venues (especially to Cocoon) will be packed