I haven't had much time to get alot of riding in on my ultra since I installed this clutch, but will share what I have found. When I replaced it I also changed the clutch spring, It was a normal tension spring. I just wanted to make sure that the old one didn't fatigue over time so I replaced it, I also installed a hydraulic primary chain tensioner. The clutch comes with one extra disc and has 3M friction pads (they make some good stuff) There is also a special coating on the steels. The clutch defiantly seems better over stock and with the hydraulic tensioner there is a considerable amount less lash in the drive line.It was easy and straight forward to install, I would recommend a heavier spring tho if you do rodeo cone riding. Plus as you mentioned there is a life time warranty, I hope I never have to use it but it's nice to know its there. I don't know what you put in your primary, I use amsoil 20w50 and a few ounces of steel shield. The steel shield is made by a company not far from me in Bethel Park, Pa. I have used this stuff in every vehicle I own, because it works. I also use it on my guns, which is how I came to know of it. I hope I helped in some way shape or form.