I am a homeownr considering the purchase of a commercial walkbehind. I have read several references in this forum to the relatve merits of gear vs. hydro drive walkbehinds. I have not read much comparing the dependability, durability, expected longevity under similar conditions (assuming good maintenance practices) of gear vs. hydro drives. Do any of yu have any experience comparing the two systems? I would assume that repairs on the hydros would be much more expensive if required.