I have never heward of them before. But they do post the spring rates on their website for each spring designed for each car. THe material is supposed to be better/more flexable yadda yadda. I've not seen spring rates posted before... something to check out. The only thing that I would quesiton is longevity and whether the spring rates were correct for your car. I guess I need to find out what mine are so I can compare.
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.
to add to what jesterfan said they are a pretty good company and very reputable with the drifting crowd and lots of JDM's..but i thought about the same thing when i did my search for springs, i wanted what works best and eventually ended up with H&R with eibach a close second
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