I cut 5-7 acres and I am close to deciding on a Z. A local dealer tells me that the hustler fastrak is classified as a commercial mower, but others have posted that this is a homeowners unit. Is there a rule of thumb that indicates when (how much cutting) would dictate that a commercial unit be recommended. Also, how does the $5400 dealer quote compare throughout the industry? Is the fastrak the machine for me? Thank you for comments.