I first came across the TypeMatrix while doing some online reading about ergonomics, alternative layouts and preventative measures for RSI, etc. 
I saw a number of videos where users were really swearing by it and then I came across one video where the user was just swearing period.  

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I know its 6 years old, but this has to be the most entertaining review of a keyboard I've ever seen. 
So this is a question for those who love the TypeMatrix. What do you really like about it and has it actually helped improve RSI and stuff?