While I have an ergodox, I completely agree with this. I'm still suffering from some RSI, but following this has helped me tremendously. I also want to add, just as you're suppose to turn away from the monitor every once in a while, make sure you stretch out your hands/arms and return it into the neutral position.

For those looking for a cheap split keyboard, a used microsoft sculpt can be found around $40 on eBay.