The only time I am able to ski zero off is at tournaments, which I only ski a few time per year. This year at regionals, I skied behind the Mastercraft, and ran in the neighborhood of my average. The next tourney, I skied behind the Malibu first, and again skied near my average. My second set was behind a Natique, with the same settings I used on the BU and MC, but on my pullout on my opener at 28, I had rope in the water, as if the boat slowed down during my glide. That has NEVER happened to me before. I was able to scrap through the pass, but went down coming back. I could get no rythm with the boat. I was blown away at how different the pull was between boats. The Malibu and MC skied similar, but the Natique felt entirely different. If I had time to practice behind ZO, I'd be able to figure out the different settings for each boat, but it is tough only having the opportunity a few times per year.  Its not that I don't like the change to ZO, it is just hard to get used to something you can't practice behind.