As a chemist, to whom "buckyball" refers to an non-magnetic allotrope of carbon, more correctly known as buckminster fullerene, the cute little neodymium (element Nd, more chemistry) supermagnets called Buckyballs took some getting used to. The cubic Buckycubes come only 125 to a set (rather than 216 for the Buckyballs), and, as others have said, they perform fewer tricks than their spherical brethren.
However, if you are a teacher with a porcelain-on-steel whiteboard or other metallic surfaces in your room, or a mother with a refrigerator, Buckycubes can be used to post student work instead of magnetic tacks. One of the Buckycubes will hold many sheets of paper easily. My office walls are steel under the paint and so I can hang paintings and the like by using superglue to attach multiple Buckycubes to the back in sufficient numbers to hold the weight.
Neodymium is a rare earth element, and the Chinese have cornered the market on the metal. Neodymium magnets are used in quality earphones and other electronic devices and in those three-bladed wind generators that dot the horizon. Prices have been rising, and the Chinese now want to limit their use to Chinese industry, making the whole device there, not just the magnets. So it will be interesting to see what happens with the supply of these Buckythings.
I will note that one of my Buckycubes arrived defective -- it was barely magnetic, though it looked the same as the others. A call to Buckyball Central resulted in the shipment of ten replacements, which was certainly generous.