I own a Z723 that I use on 2.5 acres.
I did a lot of research before going with the Z723. The Parker hydros were a big selling point for me. The $1000 rebate and 0% were just the clincher.
I've owned my own homes and have been mowing for nearly 30 years and so far this is the best cut I have seen. 8ga 6" deep deck is tremendous. It can be a risk to buy something in its first model year, but I don't think Kubota is putting forth any "new" technology here, so I am confident that I made the right choice. Only time will tell if I am correct.