i have run the WCE for the last 12 months at least once a week. I have had no problems with the diff at all. I have heard people complaining about the screw snapping at the head but i've run the same screw in mine since the day i bought it, i have 3 spares because when i bought it there was talk about this and ive never used a single one. Buy the cyclone m8, you cant go wrong.