Cutting the strap and unrolling it is every bit as exciting as other people have described!

It still 'creeps' across the carpet a bit, but not enough to make me crazy.

I can kind of feel the pad sink a bit where the chair is on it

STRONG - bit expensive but better than any other

This is a bit more expensive, but much thicker and doesn't slide around on the floor as much (still does a little).

STRONG - bit expensive but better than any other

I weigh 230 lbs and roll my chair around a good bit with carpet under the mat

It does move a bit on the carpet, but I suspect it wouldn't do so if I had shorter pile.

A bit costly though.