A long time ago I had a Zero that was a real let down, a joke of a machine. Then I had a Quantya. So much fun I bought two. I learned a bit as we modified and changed. Basically I learned enough to realize that when I saw the first Alta, I knew it was a steal of a deal. Now I have two of them. I can's seem to get out much for riding, but when I do it's such a joy!!!