I've never been able to stand one of those split keyboards. When I type my hands fly all over, exceeding 120wpm back in school with no errors. Although my hands rest in the 'home position', once I start typing my fingers go to where-ever they are expected to go based on distance, regardless of their order, then I just make sure to control the order and continue moving. Those split keyboards slow me *way*the*heck*down*! I'm not sure how anyone could really stand using them.
Thus I'm curious, what benefit do they bring you? I've never heard anyone describe what its use actually is?