We have their sheet/pad for the bed. I think we got it about
2+ years ago. I don't see any difference but interestingly, my DH dreams WAY more since we starting using it. If we travel and do not take it with us or if we don't have it on a night because it's in the wash -he notices a dramatic difference in that regard!
I also use the smaller version at work - under/with my keyboard. Again, I don't notice any difference, but feel "why not continue" as I've not noticed anything negative.