Using a yoga ball as an office chair is pretty cool. I move around a lot more, my back is straighter, and, let's be honest, it's way more fun. I still have my nice office chair in here, but I'm trying to use the ball for at least half of the day. I put a cushion under it so that I could still maintain an ergonomic workspace. I use an ergonomic keyboard, wireless mouse, and dual screens that are directly at my eye level. I get a lot of natural light and have plenty of space for 5 minute yoga breaks. :) Definitely a better work environment than the dark cube farm at work! I may work longer hours at home, but I certainly don't mind it! Plus, the cat and dog have chairs to sleep on in here.