I'm a newby who recently bought a Grasshopper 721. I'm a home owner with a 3 acre yard and I got sick and tired of repairing a POS MTD tractor!!!! What is the opinion about ag-type chevron tread tires as opposed to turf tread? Do these tend to dig more divots? I only ask because I will be mowing a few other lawns (to pay for the Grasshopper). Thanks guys!!!!!