Looking at a cheapy heat/massage back cushion... any insight?

[Sarcany]

I did use one. Shopped around and got one of the highest rated heated massagers. It died just out of warranty. This is apparently pretty common and there are instructions online about how to rip the things open to get to the electronics to do things like changing fuses and re-soldering broken joints. Once you rip them open, you can't get them back together properly and they look awful.

I ended up getting an ordinary large flat heating pad from Target that has proven very reliable. It has a 2hr timer. I set it on medium heat at bed-time and sleep on it.