I owned the first M$ split and loved it. Still use it when I am doing tons of typing. The newer versions are not as well built nor are they as ergonomic.
The split deal took me a while to get used to, however once I nailed it, I never again really enjoyed "normal" keyboards.
One more thing about the newer M$ ergo boards, they lack the responsiveness of the original. This causes people to think that they just don't get it. Not true. It is just shitty switch positioning (or responses).
Knuck