One of the things I've always hated about the old BCs was that the metal skis were terrible. In reverse, they just dug right in and unless it was hardpacked, you weren't going anywhere.
So I picked up a set of the new Pilot skis the Skandics come with. You have to grind about 1/8 of an inch off the spindle side, either inside or outside, and drill out the steel insert that comes with the skis (drill out just a hair to fit the Cat bolt) and it literally fits perfectly using the old Cat bumper. Those skis make a huge difference in performance with the BC. Now I can reverse all over the place even in deep snow, it also steers better. Great upgrade on the older machines.