I haven't heard of anybody complaining about the drive belt slipping, but mine started to slip last weekend. It happens while under stress and from a dead stop, power up to try to go crawl over an aggressive obstacle. Happened several times. If the machine is already moving at all it didn't slip. I have about 1500 milers on it. As luck would have it I had just ordered a new Bad Ass Belt from Right Coast Off-road for a spare. Guess I'll be changing it out when it gets here.