I had tein springs and found them very good the only reason that I swap to coilovers was because I wanted to take the car on a more track focus route.
I have to say that they handled both the road and the track equally well,
I understand what people say about eibach as they are an extremely high quality product and have had many dealing with them in the racing world. But I honestly think that Tein offer an equal product.
I am not just saying all this to sell my springs but I am selling a set of Tein.
I think that as long as you go eibach or tein you won't have any regrets.