I've bought a similar, though smaller, magnetic levitation platform thing and have played with it. It's certainly very interesting.
There's one huge problem with it, though. Well, two, if you count the fact that it doesn't seem very well made as I bought a cheap toy online. And the main problem is that if the power is cut or the object gets bumped or dislodged, then it crashes diagonally down to the platform really hard. This is because the floating part is a fairly strong permanent magnet. As soon as the electromagnets get out of sync or turn off, then blam!
Now, if you have a fairly sturdy model that's probably okay. The landspeeder idea that adphill mentioned would probably be fine since it's got a flat featureless bottom. If you made the thing sturdy enough then the occasional slam into the magnet wouldn't be a problem. However, I was looking to "levitate" a model of the Millennium Falcon. If you have the landing gear down, then the sudden violent impact would snap them off. If you left off the landing gear then the protruding lower gun would be vulnerable to damage. So there's that.
There's also the fact that only large ones have enough magnetic power to hold objects a reasonable height off the surface. A lot of them can't really raise things that far, and that only looks so-so. You need to experiment.
There are also ones with inductive charging built in. These transmit power over short distances, so you can light up an LED or whatever. The problem here is that transmitted power falls off with the square of the distance. In short that means that you can't get much power using small systems. Enough to power a low-amp LED, but not that much more.
So in short, it's fun, but not quite as Harry Potter magical as you might want.