The Wobble Stool naturally tilts and moves with your body as you're sitting. Plus, it’s a more affordable option if you're interested in trying out active sitting. The difference between this stool and the Swopper is the base. The base of the Wobble Stool is concave and the base of the Swopper is sturdy and still. It’s also height-adjustable. Comparatively, the Wobble Stool feels a bit more unstable than the Swopper and is less fluid in its motion. But for the price it really is a huge upgrade from a standard office chair. It takes a while to adapt to the sudden increase in movement while sitting, but once you get accustomed to the stool, it will become your best friend.