I was bout to write my impressions on the kinesis so here we go.
It's my third week using the keyboard at work (programmer). I used it for a week at home before to get used to the layout and get up to speed.
I did get some very weird looks and comments when I took it to work.
The first thing I noticed is my bad habits (and the scratchy switches). I never learned the proper typing method before and I usually type the key with the hand/finger that is closer to it when I need it. I also use my pinkies a lot less than I should.
But learning the proper method is a breeze with the kinesis. With the bowl shape and the matrix layout, you are a bit forced to use the proper finger for each column.
The bowl is a bit too deep for my hands, I think the ergoDox will provide a good balance with the slightly staggered matrix layout and will still allow me to use a non perfect typing method that is just faster in some case.
The rubber function keys are just plain painful. I used a AHK script to remap the Esc and F keys on the number row.
The thumb keys are fabulous, I'm glad that I added some more to the ergoDox from the initial 2 but I personally don't have use for more than 6 and the extra keys in my design.
I noticed that at the end of the day, my arms, hands and fingers were much less stressed than with a regular keyboard. If I wasn't building my own keyboards, I would definitively buy one. Sending it to the next person and being stuck with regular keyboard will force me to finish my project. sordna, you can send me the address of the next one on the list.
A huge thanks to sordna for doing this!
Tl;dr: Good keyboard, recommended!