I have the Equilibrium XL massage pad - without the heat - but as SEL said it gets plenty warm enough. I use a piece of cellular wool blanket underneath to prevent sweat patches.
I've got the Equilibrium pad, heated massage mit and the Epiony heat pad. All work in different ways. Did look at the heated massage pad, but my XL pad already gets warm and i pop the Epiony on their bottoms or necks when necessary.