I was always annoyed with the large area rug under my bed in my master bedroom. It looks beautiful but the ends were always rolling up, especially with the cats running on it. But with this carpet-on-carpet pad, it doesn't move ONE INCH! And I'm always vacuuming my area rug and it doesn't even move while vacuuming! It's been down for a couple of months already and still holds perfectly. Just make sure to place it where you want it, then slowly peel off the adhesive film. It sticks immediately and you will not be able to move it around easily.

Pros: Works perfectly!
Cons: Just be careful how you place it as it doesn't come with instructions.