I bought this to go under a Safavieh synthetic runner. We have another Oriental rug that's wool. It's pretty thick and we used a different, non-slip pad under it. The runner is quite a bit thinner, so this thick pad really made a difference. It makes the rug feel a lot more luxurious than it is!
The only problem I'm having is the rug slides on the top of the pad. The pad itself seems to be staying place on our wood floors. I need to get some carpet tape and tape the carpet to the pad.