This toy is fun to play with, has a lot of kind of neat shapes you can make, and is a fantastic snack-sized diversion. A critical feature of this over puzzles like Rubik's cube: there is no goal, no point, no end destination. You just kind of mush it around, assemble it in different ways, and watch it interact with itself as you put the little shapes together. It's strong enough to be tossed hand-to-hand, and when it starts to come apart the magnetic component keep the parts from flying all about.
Everybody at work seems to think it's a lot of fun too. Kind of amusing to be talking to another engineer about whether or not the FlibbleBlotz should go in the BoogerTorble (yes, we write a lot of Java code), and then said engineer will just pick up the X-Ball and start absentmindedly futzing with it. One guy ended up making a lunar lander module, and another guy who saw it flipped a few pieces and made it improved. Much more fun than a puzzle with a solution (which are good for other things).