I bought this for my dad (63) and we built it together over the Christmas holiday. I fully expected the experience of building it to be the fun part, which it was. But once we got it fully assembled, it actually worked! The gears turn smoothly, the balls roll through with no hitch. I think we spent as much time playing with it as we did building it! It's now going to Dad's office to make all the other IT folks jealous!
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