I almost picked up a used bike with a headshok that needed to be rebuilt before I got my hardrock. Did a little research and was shocked at prices to rebuild. Decided I'd rather have a bike with a fork that didn't require special tools and training to rebuild. Pretty much all the aftermarket fork manufacturers have readily available rebuild kits and though it's not a job to be attempted lightly, breaking down and rebuilding a fork is hardly rocket science. At least lefties look interesting and have some positive qualities. Headshoks just look goofy (IMO).