That seems interesting, but it feels like it would be slower than thumb-key? How long have you been using it, and how high wpm do you have? For reference, I have used thumb-key for 6 months or so, and can achieve 40-45 wpm

Yeah you can’t really “infer” where a letter is, it just takes time to learn the loiations by heart. I think I have used this for 6 months or so, and I’m able to write 40wpm without looking at the keyboard. But damn was it slow in beginning