Most of the knock off mag scrapers sink if they come loose. Mag-Floats will float to the surface for easier recovery if they become loose. As far as cleaning capability, they're all about the same. I usually use a bonded floss pad over the manufacturer's scrubbing surface. So, it doesn't matter what brand you buy if using an alternative pad. Just make sure the one you buy will float or, be prepared to roll up your sleeves.