The X350 is at the upper range of what I can afford but I a concerned about the stories concerning the transmission. How do you know if your property is too hilly for the K46? I hadn't anticipated buying a new mower at all but my old one quit so rather than fix a 20 year old mower made by a company that's out of business I am getting a new one. Is the K46 really that bad that I should be spending another $600 or so for the 370? Thanks in advance.