Another video with a really good close-up on the SDCC unit.
Marty McFly and Mattel lend a hoverboard to The 404 | Comic-con - CNET Blogs
It's the model that the booth girl had, but the pieces are the same that the model that was under display. (not the top sticker)
Back into that bottom parts, you can clearly see the fails. The battery pack withouth the big carved holes for the screws (and the actual holes are not even centered), and the plastic bump out on the screwholes from the magnet holders.
Also, it's good to point that the top magnet (and the bottom one a little), are already a little peeled up, os so it seems, thanks to the "gliding" effect.
Again, the "gliding" is so useless and stupid it's not worth the changes on the magnets to to so.
I've just throw one of my sneakers across the floor of my room, and it "glided" even at more distance than the hoverboard. I'm pretty sure that my xbox360 will also get more distance that the hoverboard if we swipe both across the floor XD
If we finally get it, we will have to make A LOT of personal working on the boards to get something a little closer to the original.
Hey, Mattel! I'll buy your look a like model from toy fair. At least, the bottom face was almost perfect, and I'll only have to work on the top face. You know, to save some time....
EDIT: I've just watch this other video and there is something very curious about it.
http://www.youtube.com/watch?v=hydCgswFMsI
When the booth girl shows the bottom face of the hoverboard, we can see it's another "working model". The magnet holders don't have the "bump out" screwholes, they're like some shots of the originals, and like the toy fair model, that was better; and the battery pack still lacks the carved big screwholes, but the actual holes are more centered than the other working model.
So, two working models were used on sdcc (maybe the first one's magnets peeled up completely after some gliding and they changed it?)
As I said before, the model under the display had the holders and the battery pack as the other working model I posted before on this same message.