I know about the twiddler, but it's rather expensive for something I'd mostly just play around with, and it doesn't really look too ergonomic with all those buttons, almost seeming to miss the point of a chorded keyboard...

I don't have any RSI-related problems (yet), but I'd like to have an option in regards to typing with one hand and not being constrained to a desk for longer texts.

Has anyone built a chorded keyboard? If so, how has that panned out for you?