Really cool product. Great gift. Gave this to a 16 year old boy who grew up in a Lego house so he has some building experience. He was able to assemble it in about 4 hours but the end result was a bit disappointing. He broke a few track connectors due to their fragility. I can't blame the makers for this part. However, the gears that went up and down the steps were bad. The piston arms had too much play, allowing them to hang and get stuck. When they got stuck, the entire structure would lift and shift, causing the gears to move apart. After all, he liked building it. But I'm disappointed that it doesn't work as intended.
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