I have the Steeda adjustable quadrant and I have no complaints. It is a good quality piece.

I know that Cody (herecomestrouble) had problems with his King Cobra at 350rwhp. He said that is all it can take. I am still doing good with my KC at 330rwhp and another 75 on spray, however, I don't hit the spray from the launch. Might make a difference if I did that on slicks...
I do not have a lot of good things to say about my spec clutch. This is what happened to me in less than 10K miles....