I just installed the TCK D/As on an E46 M3. I've driven one with the KW Comp coil overs on an E46 M3. They seem to have comparable track performance but the TC Klines are FAR more comfortable on the street. It's not even close. I'm sold, I will have TC Klines or maybe JRZs on my E90 sometime in the future.
2015 F34 328iX GT Glacier Silver
2011 E90 M3 Monte Carlo Blue
2004 E46 M3 Imola Red