Does anyone out there know anything about the Ferris Evolution? I own a Toro Z Master commercial, and I don' like how easy it slips on downhills, especially if I attemt to turn. I now learn that it is a common characteristic of zero turns.It also tears up grass,I have light soil thus compounding the problem.I'm looking at a used Evolution, but have not had an oppurtunity to drive it yet. Any thoughts? Thanks, cop