Seventh Tree is a new direction of sound for the group, & you'll find it is completely different to their previous work. However, if you reeeeeeeeeeally like it you'd like their first album 'Felt Mountain' - the surrealist sounds it creates strongly connects with Seventh Tree.
Their second & third album 'Black Cherry' + 'Supernature' are of electro/pop descent, & spawned top 10 hits in the UK. If you want to hear their more "mainstream" approach to music, the second two albums are a must listen. Otherwise, I highly recommend Goldfrapp to anybody who is curious to listen to any of their other material!