I made a changes today from the 12 month old farm's Z540M. It was making me look like a bareback bronc rider mowing 3.4 acres. After mowing for a couple of hours I would be bent over and bow legged tried to stand up straight. Even though it did the job my back couldn't take it anymore and I traded it in a new Z740R with the better seat and tweels. My BIL up in Missouri has a Z950 with tweets and says it a superior ride. Since it is raining today it will be the weekend before I find out how much better it is.