Tein SS coilovers are great if you can afford them, I bought a set late last year and I love them. However, I realized that the design and dimensions of the strut and spring assembly compared to the stock design results in a much harder ride.
If you look at the Tein's, the whole assembly is very narrow and thin compared to stock or aftermarket springs for our cars.....heres a picture to show you what I mean by this.

The Teins are more narrow and the spring really hugs the strut unlike stock which has a great big seat for the spring to sit in and "give" a little more....If you look at the stock fronts you'll see what I mean. Obvously the springs that come with these have a pretty high spring rate also, so that adds to the roughness a little. But I think that because the impact of hitting a bump is expressed through such a narrow shock and spring as opposed to dispersing the impact over a wider area with a stock configuration or even Tein springs with KYB's, the ride is obvously rougher than if you went with the latter.
So I would go out on a limb and say that if you want a better balance between ride comfort by design and handling as well as saving a wad of money, Tein springs and a set of stock replacement shocks is for you. If you want a better handling car and can sacrifice some comfort for your car feeling like a go-kart, then go Tein SS.
This post has been edited by Silver94CelicaOwner: Jan 20, 2006 - 12:56 PM