Good product and excellent customer service! If you're particularly interested in the chaos/double pendulum dynamics mentioned in the description, don't buy the 'upgraded' version. Because the outer orbital portion is two-sided, its center of mass coincides with the bearing it rotates about, so there are no chaotic dynamics. However, it exhibits decent epicyclic behavior and is still fun to play with. If you want chaotic behavior, go for the one-sided outer arm option (which is actually a double pendulum).
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