My keyboard journey was prompted by pain in my left wrist which I self-diagnosed as an RSI and prescribed a split-tented keyboard along with a course of vim-motions, twice daily, with meals. Both of these changes made a surprisingly significant impact to both my work ergonomics and speed!
I first purchased this Kinesis Freestyle 2 which was not bad, but it irked me endlessly that I could not map the CAPS LOCK key to ESC on the keyboard itself. And the Linux mapping was shaky at best.