This feels like the Kinect in that, if it works perfectly, seamlessly, responsively every time, it would be an amazing "the future is here now" gadget. But if i

This feels like the Kinect in that, if it works perfectly, seamlessly, responsively every time, it would be an amazing "the future is here now" gadget. But if it doesn't, it's just a tech demo with no real use. The pin form-factor is awkward. At least with a watch, you have watch functionality to fall back on, making it immediately useful, and you can discover incremental functionality--health, message, alerts, etc. This is all or nothing (and I think it's going to land closer to nothing).