Well i have 19 hours now on my X 739 i am impressed with its power and handling . The only complain is the back tires hitting the drive on deck brackets when the mower is all the way up and you turn hard. Thinking of cutting a bit off with my plasma and re painting the bracket. Looks like just the very corner should solve this problem. Air in the tires is correct so it seems weird that JD has not addressed this problem. I haven't had any seat switch sensitivity problem yet. The three bagger is built very well, solid as a rock and i fixed the minor problem with some stainless rivets.