I find the supreme sliders too pricey for my blood. I use a non stick microwave oven liner. It is somewhat tacky and can be repositioned. It's only about $5 and is easy to cut. I just cut out the freearm area so I can get to my bobbin case. I tape down the edges.
I wouldn't quilt without some kind of slider. My shoulders and arthritic fingers would never forgive me.