It all depends on how often you feel you want to separate the trans from the engine, if you play in the mud alot your going to have to do this job more often than if you stayed out of the mud/water. Some are better than others but the mud will just about wreck any of them. The clutch may only have 20,000km on it but how hard was it driven? I've grenaded clutches with less miles than that. If you intend to stay out of all the mud and you don't wheel it hard I'd just get a NAPA replacement release bearing for now and when you have to replace the clutch upgrade it then.