I noticed something today. I used our 160 today because it is raining (thank god I dont have an exmark as my primary mower on days like this) and did not want to get the new machine all funky already. Anyway.... the xfactor deck on the 160 is different than the 460. They made changes to the deck but never changed the name or added something like X-Factor II. The left side edge of the deck on the 160 is straight front to back. On the 460 it arches out toward the back. Maybe it is the same under the deck not really sure yet because I have not had the new machine up in the air yet. Makes me wonder if that has anything to do with gmlc's mower not working well with the stens blades. I will have to throw a set on the 460 and see if the cut quality drops compared to the oem blades.
2013 Gravely 460Z 29EFI
2011 Gravely 36GR
2008 Gravely 160Z
2004 Gravely 34Z
1998 Lazer Z HP 48 (old faithful)