I have the KW Clubsport 3-ways and love them. I used to have Eibach springs on the EDC dampers. I have not felt a significant compromise on the street and in fact like the ride of the KW's better. I have not yet had them on the track so I can't speak to their performance in that environment. Send me a PM if you would like to sample the clubsports.
KW Clubsport 3-way, Akrapovic Evolution, ESS Tune, StopTech Trophy, IND Euro Bumper & Black Mirror Covers, Turner Studs/Lugs & Delrin Diff Bushings, MRF Solid Sub-Frame Bushings, RD Sport Sways, Recaro Profi-XL & Planted Seat Brackets, BMW Performance Carbon Fiber Interior Trim, BMW Edition Grills/Gills, Mode Carbon GT4 Splitter & GTS Wing, Advan TC3 (18x9.5/10.5), BBS E05 (18x10/11), G-Force Rivals (275/295)