Nice hunt. I've been waiting for these things to become a reality since Minority Report.

pros:

• When tech like this actually works as expected it has the change to completely change how we interact with devices
• Could help users who suffer from RSI or who struggle to use mouse/keyboard input for any reason

cons:

• probably still just a gimmick for now, I feel we're a few years off this still.
• Expensive item to "Try", find it hard to believe it will sell well outside of Indiegogo similar to the Leap Motion (super cool tech but hard to sell to mass market)