Review (4/5): No stimulating massage.
Haven't figured out how to use the "wooden beads" that are covered with a small plastic "air bag." Maybe I'm using it wrong, but I don't feel the beads. In fact, I don't feel anything different. Feels like I just took the handle of the brush and rub it against my back. No sensation of massage, beads, or even pressure when holding the brush by the handle.
Still, the brush part works fine. I've had one before and it lasted a reasonably long time without problems.