I’m glad to see you found others testifying to the truth of the B&D tool - a tool that although designed and built for vehicle beautification is a low-cost top-shelf option for self-applied physical therapy.
It can be a bit tricky for some to use at the outset, but patience and creativity in using the tool are amplely rewarded.
To my mind, it combines the best attributes of a handheld massager with those of foam-rolling. Plus, if you run the tool head flat (fully flush) on a problem body part the rotating head generates a penetrating warmth that can be controlled by applying more or less pressure.
As you can tell, I can’t speak highly enough of the waxer/buffer as an essential massage or PT tool.