I have both. I agree with the gripes about the thumb cluster acting as a pivot, it's not an optimal design but it's plenty comfortable for me. The big reason I

I have both. I agree with the gripes about the thumb cluster acting as a pivot, it's not an optimal design but it's plenty comfortable for me. The big reason I wanted to try it is the thumb layout is more ergonomic and conducive to chording. On the right thumb cluster I map the four keys to 15 bit encoded layer. I don't _use_ all that space, but I have over a thousand keypoints at my disposal. But I do use the bottom 3 (plus base) quite heavily. It's more ergonomic to move frequent keys to near home rows in a higher space.