This pad is pretty good (like the description says).  We picked it because its thin, and we needed a door to be able to open over the rug.  Just put it in the room last week, so can't comment on durability at this point.  It was just 1-2 inches larger than the rug dimension, but it was every easy to cut off the excess.

In another room, we have the "best quality" rug pad (different product), and its very thick so wouldn't have worked in our room with a door opening over the rug.