Well, first of all, no springs are good for the stock struts. They will wear faster. I had stock STi springs on my wrx and didn't like the ride height so I went with Prodrive springs...ride height=very nice but ride quality=bad. And, within a few thousand miles the struts started to get worse, go bad. Because I didn't have the money to buy coilovers I decided to change struts. I went with a set of STi struts (thinking it would provide better ride quality than an aftermarket strut). It did provide better ride quality but it's still pretty stiff.

With that said. I haven't ridden in a WRX with Tein springs but my bro has a Mazda Protege with Tein's on it and it rides great and the ride quality is pretty good too.

I'm still not happy with my suspension, and probably won't be until I can adjust the ride height and dappening to just my liking. So, unfortunately, I think it's going to be a trial and error process. Ride in other peoples cars, see what you think. That's the best way. And then save your pennies for some coilovers.