I mow 5-7 acres per week and have been looking at Z's. A local dealer tells me that the hustler fastrak (looking at 52" 20hp) is a commercial mower. Is it classified as a commercial unit or homeowners, as others have posted? Would my amount of mowing warrant purchasing a commercial unit? He quoted me a price of $5400 and I am curious as to how this figure compares elsewhere. Someone recently posted their price of $4800 for same unit. Thanks for your comments.