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I've seen a few Boosted boards in the wild, they're definitely real.

Yep, I got to ride one a while back. As someone who doesn't know how to skateboard it was pretty much terrifying real.

I rode one at SXSW in March 2013 -- they're yet to be made available commercially?

I think they've already shipped a fair number of the Kickstarter backer reward boards.

Romain Guy, a Google engineer (formerly Android, now works on their robotics stuff I think) has tweeted about riding his, so that sounds right.