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I've played with one of their kits, it's definitely fun. The level of definition for different textures was surprisingly good as well.

Worth noting that you have to orient your hands horizontally to the device like with the Leap Motion to get a consistent result.

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From your account, and looking at the pictures, you need to hold your arm/hand/finger in the air to make this work.

How long can you do that before it becomes uncomfortable (aka "gorilla arm")?

Good point, although I wasn't using it long enough to know exactly. I imagine you could apply the same rule of thumb as with other gestural controllers.

Another aspect of fatigue would be: does the user become fatigued/insensitive to the haptic interaction over time?

How does this compare with what Google[x] has been developing in the RF gesture recognition? In the videos they are using a Leap Motion while G is "suggesting" using your fingers as support.

Haven't tried Soli if that's what you're referring to, although I don't see how they compare as Google aren't doing mid-air haptics?

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