I've had a basic ergo keyboard (MS sculpt ergonomic) for a while and it's much much better than regular keyboards;
However I think all ergo keyboard companies are missing the point those days:
"Just-a-keyboard" doesn't cut it anymore in the world of laptops. I want an ergonomic keyboard with a built-in Macbook-class touchpad, or ThinkPad-class trackpoint + three buttons. (I know it's tricky, especially with split keybord; conceptually it feels it almost can't be done).
Unfortunately most of software those days has pretty limited functionality if you want to use it 100% with a keyboard only. And no matter what best keyboard you have, adding a trackpad or mouse to it is just clunky and slows you down due to endless context-switching.
Are there any examples of ergo keyboard with built-in pointing device? I never found any.