The 4-spring corse clutches are the shyte!
I thought my Yoyodyne was good, but I could get it to lock if I got really sloppy. The Corse clutch tho... buttery smooooth. Just went to Carolina Motorsports Park for the first time this weekend. Got a little overzealous while learning the track and the clutch saved my ass on a couple occasions. As far as lovngevity goes... I'll have to wait and see; no problems with my Yoyodyne after 6K+ miles