On a kinesis keyboard all the emacs modifier keys are by your thumbs. It makes emacs so much more awesome
I tried to get used to it, but my foot pedal is just collecting dust under the desk now.
If I had the money, I'd try out the Maltron 3D keyboard. I haven't heard about such problems with it. It also comes with a numpad in the middle, which I kinda miss in the Kinesis. It would be great for nethack, and something else.