clutches are rated by clamping pressure, I do not know of any clutch that will be covered by a warranty from a clutch dump or clutch kicking at 100 kmh etc, basically that is abusing any clutch. The opt 4 clutch uses a cerametallic clutch disc, and any clutch no matter what brand that uses a plate like, this will not last for a lot of klms with normal street driving, also the take up can be a bit shuddery but that can be dampened by using a sprung centre but then that weakens it.