Tein springs are actually very good. I have a set for my M3 project. They are very good quality, and go through all the rigorous testing the DOT requires. They have been tested in quite a few magazines lately, and you see more and more cars running them. They have apparently been around for a long time in Japan, and have a great reputation there. Specifically the coilovers with Electronic Damping Force Controller (I think that's what they call it). This box and 4 motors (one for each strut)let's you adjust your dampening force from inside your car. That's really cool. A lot of the drift cars are using this setup now. And they cost quite a bit less than comparable setups. I believe you can get the coilovers and EDFC for less than a set of Bilstein, H&R, or Koni coilovers.