From the one person I know that has them, I here very good things about Cusco coils. They're on his 08 EVO. And from a lot of guys, with a lot of different cars, not so many are fans of the Tien's. Just my .02 since I've never actually used either of them personally..

However, as an alternative, a guy who works at an exhaust shop in my area has had BC coils on his 05 Legacy 2.5i for a while now and he constantly raves about them whenever the topic comes up in conversation. I've personally driven his car, and I have to say that I liked them. They even give a fairly comfortable when set at the softest setting.