What's 1/2 acre and more? What's more? 30,000? 40,000? If you can use this ztr on most of your lawns you are definately going to speed your production up over walking them, biggest thing is that you aren't going to be dead at the end of the day. Look close at the walkers, but think about the grass you are picking up. How are you going to handle the clippings? They certinaly pose more of an issue than a machine with regular bags that can just be picked up to dump in your truck bed. as for a midmount ztr, I'd look at Toro, Exmark, Grasshopper, Hustler?, and whatever else is avaialble close to you. A commercial mower with a PLASTIC blower fan? Have you seen one, with the center bag area blocked off to make the wierdest catcher design ever... (talking about the kubota).