I have played with the neocube. This toy is a collection of spherical earth magnets. Magnets make it very entertaining to play with this toy. One can create many shapes as shown in the video below. After getting a taste of it, I am planning on purchasing it.
Thanks for the instructional videos, you can find more about the coolest puzzles!
It can create very nice shapes. http://www.neomagnet.org/neocube-shapes