It looks like you would get severe pain in your back and neck after about 30 minutes of using that thing. If you don't believe me, try holding up your hands in front of the monitor for a minute straight. You can move them around a bit if you like. I you feel awkward, just pretend you are conducting an orchestra. Now, after one minute, how do you feel?
When I use my smartphone, it annoys me that I can't really see where I'm pointing my fingers, because they are in the way of my eyes. Now, with this new gadget, I can get annoyed at my computer too, for the same reason!
A lot of people are going to buy one and never use it after the first half hour session