Hello eveyone, first off thanks so much for all the help eveyone has listed. It has been GREAT infofor us Newbies. I am just starting a lawn aeration business this spring in New York state. I am looking at purchasing a used RYAN Lawnaire V Plus for $1900 vs a new unit for $2800. I was told the used unit has around 20 hours on it. What should I check before buying a used unit or should I just pay the extra? Thanks so much for all the help, Plugnalawn.