BrokenCogThose are terrible quality, even lower than Buckyballs. You can tell just by looking at the picture that every sphere is a different shape and size with a huge tolerance (None of the magnets in that picture actually sit in a line). They also state you will get a "Random shipment of colors", whatever that means.
You'd be better off getting these if you want a cheap set of magnets, although the quality is on par with those of Buckyballs, something which i don't understand as Zen Magnets made their reputation on displaying how bad Buckyballs are.
BrokenCogPlease be aware that the magnets you linked for comparison are 3mm, not 5mm. In terms of volume, 3mm magnets are 22% as as much magnet as a 5mm magnet is. It would take the material of *Five* 3mm magnets, to create *One* 5mm magnet.
http://www.focalprice.com/YM376S/216_Magnetic_Beads_Classical_Magic_Cube_Puzzle_Silver.html
Basically, about the same ratio as most things on MassDrop.
-daniel