I bought a 451 new last year and could not be happier with my decision. I have moved over 100 tons of gravel for my road and shop area. Moved ay least that amount of snow, pulled and dug out trees and this unit just keeps on booging. The only thing I have had to do was tighten up the hyd. couplings here and there which is normal. I have the rear tires filled and it works great in snow, mud or dirt. I really like the hepa filter for the dust, it's nice to be able to plug the ipod into the radio and also have a remote for the radio. Heater and air cond. also makes life on the tractor enjoyable. But the down side is telling the wife I will be out working with the tractor, as she no longer believes it's work. Hey, until I get a TV and Bar with toppless server,,,, it's work 
