I bought the Sew Slip brand rather than the Supreme Slider. The Sew Slip is twice as big and costs less.
It makes a huge difference for me, especially when I'm wrestling huge quilts.
It sticks to the machine and cabinet just fine. When it gets dusty on the sticky side, that can keep it from sticking, so I just rinse it under the faucet and let it air dry.
I don't think that it would be useful for any kind of ironing - it's too thick and the sticky stuff would probably melt or peel off of the back.
But it's a gem for free-motion quilting! :)