We bought a 30" exmark two weeks ago and I will be buying two more in the near future. It saves us so much time, cuts way better, and despite other reviews turns around just fine. My only complaint is the handle is extremely low and does not have an adjustment mechanism so we had to drill two holes. I am an average height of 6'. I would highly recommend that you replace your 21" mowers with one of the 30" mowers out there.