Barry,
Only have about an hour on it- one light snow. Enjoyed using it, especially with the cab/heater. The fit and finish is very good. Controls are responsive. Its quiet and nothing rattles except the tracks.
There is a steep section of our driveway that under certain conditions (packed/icey), 4WD tractors won't climb it. The test for this Gehl is if it can rather than those tracks turning into two sleds. We'll see, but its been mostly warm so far this winter. 50F the rest of the week.
Don't have any conventional skid steer experience to compare with but my impression of these tracks is that if the snow is soft enough to leave an imprint, the machine will go about anywhere.
During the demo this fall, it had rained the day before and I had some piles of clay out on bare mud. Filling the bucket was not a problem. When you lost traction, it just sheared off the lug pattern in the mud rather than dig a hole like a tractor would. It also scooted across some very soft mud that you would sink to your ankles it. If you haven't seen ASV's web site, they show video of their tracked loader in some serious slop.
John