[gcoda]

Grid is a bit more intuitive for me, i am not sure how curves and arcs will do for me, grid is really easy mental map, befor this grid keyboard i was not 10-finger typist, now i am, even on regular keyboards.

Biggest downside of regular keyboard - spacebar lots of useless space, put 5 buttons instead of one, your thumb can push a lot of buttons while other fingers do not leave home row, make 2 of them space, shift, ctrl, backspace buttons under your thumb. This is main reason ErgoDox or Kinesis are good, and regular backspace and return key position sucks, keeping index finger on J while pressing Backspace with pinky is a challenge that moves your palm.