I have a 455 with 1,300+ hours on it and it has been one outstanding tractor. It was expensive when new as I bought the tractor, 60" deck, MC Collection cart, Quick Tach front unit, 54" blade and two stage snowthrower and it was all of $12,000 at the time. Mine is a 1998 model year and it is NOT an AWS unit. I would give it a score of 10 out of 10 for ownership satisfaction and quality.
Two of my neighbors (we all have 2.5 acre lawns) at first bought lawnmowers at the Box Stores. They just loved jabbing me about the cost of mine. Well, they each bought new John Deere's last year (after wearing their junk out), one the x500 series and the other the x700 series 4wd gas model. He had asked me about the Yanmar and I told him that mowing it uses .5 ga. FPH and the same when blowing or plowing snow. The extra torque of the diesel is simply amazing.
I let him drive mine so he could see the mowing capability. He bought the x700 but didn't want to step up and spend the extra $ for the diesel. This winter, My neighbor with the X700 wanted to see how his compared to mine blowing snow so a couple of months ago, we went into the street and started side by side and at the end of 100 yards, I was close to 90' ahead of him.
We have private roads and I plow 1.1 miles of roads with my tractor. I have it set up with a salt spreader, an LED Plow light on a pole mounted pedastal off the rear hitch. My latest project is I picked up another JD 54" plow which was used I am using the plow board to "adapt" my stock plow with wings and I am increasing the height and roll of the front. I will have to post pictures of that when I am done. I am not going crazy wide and I am welding my wings in place so they will be at reasonably mild angles so I can still back blade with it. Plowing the roads, I just need a bigger plow and I got this one for $50 so it is getting chopped to add to my good plow.
I am swiping the quick tach mounts from the plow blade I am cutting up and mounting it to my 10 hp leaf blower so I can put the leaf blower out in front of my tractor and hydraulically angle the blower while driving back and forth on the yard, roadway, etc. Seems I have developed a cardiac problem and my days of pushing that beast all around the yard are over.