I am late to this party and maybe you’ve already made the decision. If you can mow your 1/3 acre with a nice $300 (just guessing) mower in an hour, your decision is more whether to invest $8,000 (Z422) to mow in say 15 minutes. There is the issue of scalping on turns on the slope, and even on the flat, depending on speed. I have been mowing 5+ acres with a Scag Cheetah for several years and still have difficulty not scalping (with the inside rear tire) on turns no matter how careful or slow I attempt the turn. Don’t get me wrong, I do enjoy the ZTR, but I use it on the larger property. I use a Simplicity Broadmoor on the 1.5 acre yard here at home, which takes about an hour. Good luck!