How are they thousands cheaper than other brands? Are they just keeping the price (and profit) low for all the poor landscapers? A unit that large should have a 21CC pump on it. Pumps are the "weak" link in the system. Especially HydroGear. Most wheel motors are overbuilt for the application anyway (unless they are HydroGear). Little things like that add up. Thus the lower price. We are entertaining the possibility of taking them on as a price point, and price point only. There is no best Z out there (yet). All have good/bad points. Personal opinion makes a brand the best. But that just my opinion.