It arrived and does indeed get hot. I even had to turn it down from the highest setting.
I do have quite a few quibbles, though:
1. It is quite heavy. Not enough to be uncomfortable, but I could see the weight bothering some people.
2. It's a bit stiff, which makes it a little awkward. Don't get me wrong--it does bend. But depending on how you're using it, the stiffness might be uncomfortable (I, for example, am draping it over my right shoulder, and the edge of the pad hitting my neck doesn't feel great).
3. You can feel the stones in the pad, so lying on it might be uncomfortable to some. I don't mind them, myself.
4. The power cord plugs into a socket attached to the pad, and, because the stones have to face the body, one sometimes can't position the pad in such a way that the socket isn't in the way. With the pad over my right shoulder, the socket is at the bottom right, where it's kind of annoying. If I were using it on my back or my belly, there would be no problem.
Conclusion: The temperature and the quality of the heat make me willing to tolerate all these drawbacks, though, of course, I would prefer not to have to. Depending on how/where you would deploy it, you might be more or less content with it than I.
I didn't realize it wasn't a new mod until point 3.