It's only been a week since i installed the kit. Springs are noticeably stiffer, but not too stiff. (My last clutch had 60,000 miles. '08 ninja 650) Grabs great again. I did measure the old and new and noticed that the older worn parts were thicker than the new! This didn't make sense to me, but it works. Obviously it's not back to factory specs like advertised. but as long has it works, I'm cool with it.