I have never owned or operated a ZTR mower, I have recently located two 2006 Dixie Chopper XWD3500-60 diesel mowers for sale, and I am considering purchasing one or both of these mowers. These mowers were used commercially, One mower has approximately 900 hours, the other approximately 550 hours, they are priced at $3000.00 each. I know the mowers are not stolen. Is there any particular flaw with this mower, this price seems overly cheap and I am concerned that there may be some underlying issue with the mowers. Any advice as to what to look for?