I have officially resigned the standing-desk experiment. There was a lot I liked about it and I would definitely try again, but there is really something to be said for proper sizing. I don’t know if my rig was too high or too short for me (being a shorty, I’m guessing too high) but the pains in my shoulders by mid week were unbearable.
So, it’s back to my Swiss ball for now, which is fine. Works for me, but I do have to make a better effort to get up and walk around more often during the day.