[quote author=sfsuphysics link=topic=4859.msg59448#msg59448 date=1224291906]
Do those pads only work with the $100+ magnets they sell (I'm guessing quite a bit stronger than the $10-$20 "generic" ones)
[/quote]
Their magnet setups are second to none, you could probably use the pads with other units, but I wasn't joking when I said it's the best investment I've made buying Mighty Magnets, specifically the MF2. Yes they are MUCH stronger, for 3/8" acrylic or less I have to put the sock on the outside of a mighty pad to be able to even move the magnet around. That is a good thing because the more you move the magnet around the more likely you are to scratch your tank. Put the super algae sock on the MF2 and you can clean up to 1" acrylic, even the stubborn "diatom disks", and hard green algae.