Pros: suited perfectly for my VariDesk adjustable standing desk (obviously--same product line), has the "wobble" feature so you are forced to use your core to keep yourself upright

This thing would definitely encourage standing because you can't sit on it more than about 25 minutes at a time.

I feel safe on it because my heels rest on the chair's "foot" so I'm holding it in place as I lean back on it.