Apparently this is a new model, and has some sort of automated, hydraulic weight jacking system that can be enabled or disabled. It is available with three different Kohler engines. Has anyone here had experience with this model? ....and how does it compare to Grasshopper's front mount? I realize that there are those who will simply say that Grasshopper is better than Gravely, but I am interested in a more objective comparison. What are the feelings of the group on Gravely in general?