So all the best wishes to the author.
But there are some tradeoffs why I probably not buy it.
1) I'd suggest a column of home/page up/page down/end (top to bottom in this order) on the right side, like some laptop makers do. They're very convenient. That's absolutely necessary for text editing or navigating in various windows. (Sure one can use combos, but then you must stick to the keyboard all the time.) Del/backspace probably also should be different keys.
2) Missing menu key also requires you to take mouse sometimes. Laptops can get away with touchpad. But with the minimal keyboard, that requires user to hold it more and use combos, you must leave the keyboard and take a mouse to open a context menu.
A general philosophical question (not a negative comment to this particular keyboard): do we really still need key rows to be shifted 1/4 of width, because keys needed arms underneath in the late 19th century?