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Title: Fun for kids; fun for adults
Review: The kids (ages 6 to 9) were interested in this toy somewhat, but after assembling it twice, (because it blew apart the first time), and then assembling it again the second time it blew apart after running for 20 minutes or so. The spring case was subsequently cracked and is now useless. The toy would have some usefulness if it worked properly, but is now consigned to a box of gears & spare parts. This was a sad end for this Christmas present.
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