Ask HN: programming with a chording keyboard

I've recently been having some difficulties with typing: turns out it isn't my wrists, but rather I'm pinching a nerve somewhere in my arm/back whenever I flatten my arms out to type. I'v been investigating alternative keyboards and came across the Twiddler chording keyboard (http://tekgear.com/keyboards/chording-keyboards.html). Has anyone used this to program and if so how was your experience? What major drawbacks did you experience? I use emacs as my primary editor and I'm mostly in an SSH shell.