I love the idea and overall effort, but I really dislike the "push" nature of the top row for both fingers & thumb.

Our fingers/thumbs are incredibly weak at opening vs contracting. The actuation force of the top row would have to be very low compared to the other keys.

Thumb row, left/right movement is preferred over forward/back. It's actually why I dislike the Ergodox thumb cluster. Top row thumb buttons are out of reach and our thumbs aren't well suited to go up there. Better to put rarely used keys on a different layer.

My favorite out of the "kinesis like" so far is the Dactyl[0]. But dropping $400 just to "try it" is too tall for me.

[0] https://ohkeycaps.com/products/built-to-order-dactyl-manufor...