I like the idea of a supreme slider but not the price!! I bought teflon sheets on Amazon; they're designed to go on the bottom of your stove. You get two per package, each is double the size of a Supreme Slider, and it costs about 1/3rd as much. So what is that...12X cheaper? I bought a total of four of them and they cover most of my sewing surface. Drawback is they aren't sticky on the back; I stuck mine down with double-sided tape. They're also black so not as pretty. But they work great!
Don't get stuck in the trap of buying gadgets just for the sake of buying gadgets. Be selective and get the ones that solve problems you're actually having.