I really like mine, been using them for years and they work really nice when used with a heat gun instead of hot water. They make different sizes and I think they have changed their design slightly because mine seem gripper than the one in the video and it looks slightly different
I'm guessing that stuff is essentially heat shrink tubing with some grip holes in it. That said, to get a nice, tight fit on a donut or ABE, you should start with the boiling water (heat gun would work as well) on the widest part of the donut or ABE, then work your way out in both directions. If your donut isn't right at the bottom of your butt end, the Sniper Skin may not wrap around the butt end like Tom's did. Also, it probably won't fit over larger donuts, like the one Rabil uses.
Next time, use your heat gun instead. They probably instruct you to use boiling water, because most people don't have heat guns. It would be cool if you did a head to head, Sniper Skin vs 2" heat shrink tubing.