In response to Hortons comments above I too have railed against ZO's pull. As far as I was concerned the GPS in ZO and Gazer stood for Garbage Pull Systems! I am a scrapper and have skied a Sixam 1.0 since 04. Tournament scores are two passes less this year than last year.  Switched to a different Sixam with the same results. Last week I skied on a Radar RS-1 and the dam thing is so fast in comparison that I didn't really notice the ZO. The ski maintains speed through the turns so well that I don't think the boat knows I'm there! I certainly didn't get the bone crushing throttle response I was expecting when on the Sixam. Now, If MS could drive a straight line through the course that would help too!!! Style, ski, technique, water temp, boat mass, etc. all make a difference especially with GPS speed controls. ÂÂÂ