As an ergonomics freak and 36 key split ergo daily driver who is interested in AR and more flexible work environments, this is absolutely fascinating. I have dreamed about something like this - more of a cube shape, and with the keys on the sides instead of on the back. I am very curious about the comfort and how it is to use over a long period of time for activities like programming. $500 ($400 + $100 shipping) is a lot for a curiosity though, but I LOVE everything about this board.
I wish it didn't sound so cheap. I wonder if filling it with foam and using sound deadening on the plastic and getting some good switches and caps would help it sound less like a cheap toy. Hm