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Title: Good but not very unstable
Review: I've wanted one of these things for ever after seeing it used in lots of good exercises on the interwebs. I got the Elite because I wanted something large enough to squat on but it's not quite that big and I'm not that big (5'9"). They make an even larger one that I would get in retrospect.As far as instability devices go it is not as unstable as I imagined. Wobble disks are far more unstable. I find it is useful for unilateral stuff, especially with your shoes off.If you have to sit at a desk a lot, like I do, it works well as a pad to kneel on to get you out of a sitting position sometimes. Although you could probably get a gardening pad for much cheaper to do the same thing.
