Despite these having been around for a while, they still seem rare.
I've done a little bit of googling and there seems less information out there than I would expect.
Has anybody had any experience with them? Neck and spine saver or just a gimick?
I've done a little bit of googling and there seems less information out there than I would expect.
Has anybody had any experience with them? Neck and spine saver or just a gimick?


