Iam looking at buying a Ztr, and looking at Gravley Pm252Z. Iam currently running a 48" and 36" Pro H W/B and I love em. I have had no problems and run them hours up hours day in and day out and they still keep running great. I would put a Gravley w/b up against any exmark or hustler any day. I am just not sure what their Ztr are like. If anyone here is running one, could you give a little feed back.