I have one which is well over 5 years old, had it for 3 and it's skipped twice. It's the best thing in the world since you don't have to worry about the drivetrain at all. But... I wouldn't buy one now. My mates have had endless problems with them, one broke his axle TWICE despite being a completely novice rider, the other broke his axle a few weeks ago, another one of my mates completely f**ked the internals and the hub kept skipping on him to the point that he couldn't even ride along. To be honest, they're shit hubs but some of them work well. Definitely not worth the risk. If you want one, get an old one from the US off an XC/road rider. I think that soon we're going to reach the stage where a good but used King hub will cost as much as a brand new one.