I actually didn't like the HHKB for coding... the arrow key layer is just painful to use for long sessions. Other than that, I loved the HHKB Pro 2. And if I didn't use arrow keys so much, I wouldn't have sold it
.
That's why I'm interested in the
space-fn keyboard layout. I like the idea of chording the space bar instead of the out-of-the-way fn-key. Alternately, there's a way of re-mapping win and fn to swap places, then swap caps lock and win key on the left to get a more convenient fn-key. I've yet to achieve this however.
I like the 60% format ok enough for programming, mainly because I use IntelliJ and RubyMine most of the time, which have some pretty crazy useful keyboard shortcuts.