This is a review of the latest KingSong S18 version, with Molicel batteries and the hollow motor. While lacking experience with other wheels, I know already I'll never buy a KingSong again. I chose the S18 well aware of its drawbacks (limited top speed, poor range,...) because it was an 'old' product, and reliability was paramount for me since I planned to use it for commuting. Poor choice. The S18 started making horrendous 'clunk' noises after only a few hours, caused by the bearings being misaligned with the stator mounts. And I CANNOT fix it, because the bolts holding the axle are jammed, which means I can't remove the motor to open it and glue the bearings back. Riding an electric unicycle is tons of fun, but I wish I would have stuck to eBikes and scooters.