Mowing .25 acres every week of the summer on a perfectly flat lawn and following all of the manufacturers recommendations such as always running at full throttle while moving and allowing the trans to warm up and cool down when the time is appropriate will allow a K46 to last a decent amount of time. Outside of abuse and the occasional defect, these transmission can last 10+ years. Upgrade to a hydrostatic that is user friendly serviceable and you can last 20 years or more. Its just me but if I were spending your money, and I had to get a John Deere for whatever reason, I would be looking at the X300 line or better. It's not to say that the lower models are bad, but considering that the E series is built to a price point more than it is features and durability, that should tell you something. The S240 falls in the middle, but with the sales that Deere does in the spring, the X300 series is just a couple hundred more.