Currently have a 46" MTD mower that is 15 years old. Takes about 1.5 hours to mow what I mow. Mower is rough so I am considering replacing it. Lookes at a Gravely ZT XL 48 for $4100, also looked at some Husqvarna, Cub Cadet and Exmark. Gravely seemed to handle the best. I have a few small slopes that my current rider handles ok. Debating if it is worth a couple $2,000 more to get a zero turn. Would it save that much time?