I thought this article was annoyingly useless as it did not provide any details of how much charge this magic juice thing actually manages. So I went to the website and the reason became clear. Mobee doesn't either. Hmmmm.
The most likely situation you would want to use this is a camping trip. Then two charges may not be enough. There are plenty of higher capacity chargers around at a much lower price. Clearly you are paying for the wireless charging. Considering how often the magic juice would be used (not often), what is the point of wasting resources on that?
That said, the wireless magic charger for the Apple Magic Mouse looks very, very cool.
Edit: on second thought, you need to plug the charging station with a cable into a USB port. The whole idea of a wireless mouse, trackpad and keyboard is to not have cable clutter. What is the point?