The video makes it look cheap. He is really careful when he puts the key in.
Problems I see is that there is no place for external power. So If you run a Pen tab and or other devices like scanners etc, you will not have enough juice.
And I was a little saddened to see that the button did nothing to the computer. It would be great if it acted like an interface and when you pressed the button you could trigger an event within the keyboard. Instead you get a 4 bit sound effect blasted through a little 1 inch speaker. Hmmmmm. That is $62.99 too much.