I purchased a Craftsman Lawn Tractor Model No. 917.28714 DLS 3500 Limited Edition In April of 2007. I did not purchase any Maintenance Agreement. I previously owned a Craftsman that i had for 17 yrs and it still ran good when i got ride of it and purchased the new Limitied Edition in o7. I did not purchase the Maintenance Agreement because Craftsman always made good products and it was not necessary until i purchased this tractor. I have had trouble with it staying running for 3 yrs now. I have changed fuel filters, spark plugs, clean air... read full review »