Love the front end and the rear bumper cover. Can make my mind up on the roof and boot spoilers, but would need to see int he flesh to make judgement. Better than most of this genre of aftermarkets that we see.
It's a bit of a "Halfords special" IMO. It's always at the 'Ring when I'm over there, and looks fugly. Too much going on. Doesn't seem to be any quicker than standard either, so my guess is that all the mods are cosmetic.
Take one of the prettiest cars BMW have ever made and ruin it. Modding the Z4 really should leave the basic body shape alone IMO. Carbon bits and bobs are fine and can enhance the basic design a la Mr Sixspeed but that's just gross.