I saw the X-Base in Akihabara, but they were too expensive to justify buying.
I did get a Chinese knock off version like the Gomo, and they work nicely, but you pretty much have to have the item on the base (that's how it works).
But I also noticed the chinese knock off one heats up if you leave it on for too long, so I think it's near for occassionally plugging in, snapping a few shots and that's it. Not as a permanent display.
I was thinking of using them on my Valks thrusters