I have to give my props to the boys at hustler. We have been running hustler for 6 years now we started with a 60 inch super z and the mower has almost 3 thousand hours on it and still runs and cuts great. We added two 72 inch super z's to the trailor one is a liquid cooled and the other a fuel injected xr-7 and the fuel injected is my favorite but I would cut with any of them any time. They are tuff enough through regular mowing and clean ups year in year out and these ones get worked hard all day every day. Best on the market in my opinion.