[Xringer]

I looked at those Slip-n-Slide gizmos for a bit.. They look nice for light snow.
But, when you have a hard-shell of ice over the snow.. Or ice dams..
Not sure how well they would work.

Last winter, the winds made some big drifts with all kinds of odd surface angles and varying depths of snow on the roofs. It was pretty hard to get snow coming down with a metal shovel.. There were layers of hard snow inside layers of soft snow..
I had to really work to bring those layers down. Working from the tops of the piles..
Driving a blade under that stuff would have been impossible..