I currently have a 10 year old Gravely residential zero turn (1944) with the Kohler Command twin engine. I only use it for residential but we do have a little over a couple acres to take care of. Some of the terrain is very rough with tree roots, rocks, etc. I have put a beating on this Gravely and it has done very well, but would like to upgrade now to something more heavy duty. I was looking at getting a Gravely ZT 60 HD next year, but stumbled across our local Home Depot that has an Ariens Max Zoom 60 on sale for $4088. If I'm not mistaken, this is the same mower as the Gravely. But my question is, the Ariens has the Kohler Courage PRO 25 instead of the Kawasaki engine... do I need to stay away from this one? I have read horror stories of the Courage line, but not sure if it applies to this one since it's "Pro"? Any suggestions?