I've never even heard of a Z Cat but it looks like a home owner Scag. Probably low resale value.
Scag is running a 0% for 48 months finance program right now. If I were you, I'd step up to a Tiger Cat if there is any way you can swing it. To me, that's where the commercial Scag line starts. You'd be buying a solid piece of equipment with great resale value. Not to mention, the Tiger Cat is equipped with the Velocity Plus deck.