I've never seen one operate in person but from the videos I've seen, I think it spins the balls much too fast which causes more friction (heat) and friction leads to wear. It's also worth noting the balls only spin on one axis during operation which may or may not lead to areas that do not get cleaned. This may be a moot point given the cleaning pads around the ball openings but again, I've not seen one in person. I do now there is a thread on here discussing the electrical aspect of the unit not being up to US standards but I didn't dive too deep. Not sure if it's a fire hazard, but if it were me, I'd research it prior to using it in my home.