I thought so too untill I started having RSI/CTS issues. I've since switched to a 'fancy expensive ergo keyboard'. And it fantastic, I'm about as fast as I was on a traditional qwerty, but with less errors. However most importantly I have far less RSI/CTS complaints when typing on my redox than I do with a non-split (even ergo non-splits). My arms are in a far more natural position and so is my wrist thanks to the tenting and tilting I can do with the redox.

So if you are typing a lot, I would recommend getting an ergo before you start having issues.

For reference I could type about a paragraph in one go on a regular keyboard, now I can type an entire page before I start having pains/cramps.