What an Ergodox lets me do is this: while standing, with good posture, I extend my arms, level with the ground, to where they comfortably and naturally want to be.

Then, I put the keyboards there, adjust the desk up to that height, and put books under the monitor until the center is exactly level with my eyes. Trackball to the right.

This is dramatically more comfortable than anything else I could be doing. It's hard to convey how uncomfortable a straight keyboard is to someone who hasn't tried the alternative.