Well designed, well documented, easy to use but difficult to build (I think this is the hardest toy ROKR has). There are tools, attachments, especially small parts and screws, so if you break or lose a few small parts, there is no need to panic. This one also has dual mode (manual/electric rotation), the electric rotation kit is in the box, so there is no extra kit in the box (there isn't that white little box shown in the bottom left of the picture).
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