Comments by "roidroid" (@roidroid) on "Anti-Gravity Wheel Explained" video.

It's an awkwardly balanced object. It feels heavier when not spinning because it takes extra effort to balance it while you're lifting. When it's spun up, you no longer need to exert effort to keep it balanced in your hands. So it becomes just as light as if you were doing weight training on a cable machine. You are feeling it's true weight, which is less than you'd expect. It's really a reminder of how much extra effort we expend trying to balance things. There's probably a zen koan in here somewhere.
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