Well I don't have the X475 but I do have the X485 - same machine just has EFI. Got over 500 hours and never a prob. Use it year round to clear snow, mow a few acres, pull a garden trailer and use it to pull drunk nieghbors around during the summer on a large 6x9 trailer. Has a ton of power - maint. is straight forward.
Just bought an 2003 X475 with <300hrs on the clock 54" deck with 14bush. bagger. Very impressed so far. The traction control is great and it seems to have plenty of power. I have not used any ground engagement yet but am looking forward to it.