The Rattlebacks are well made basically a solid piece of plastic, with no seams, burrs, or sharp edges. The colors are clear and crisp I have the translucent ones and they look great. The size is good too, about 3-14/16" long. I appreciate that they are not cheap crappy molds.
The Rattlebacks spin nicely and easily on smooth surfaces, and indeed they do reverse direction. You spin them clockwise, and they start to wobble then spin a little in the opposite direction. It's cool to watch and demonstrate to someone. I wish that they would spin longer in the reverse direction, but that's not the toy's fault, that's just a limitation of the physics.
The Rattleback also slightly magnifies writing, so I suppose it is also useful to have on my desk.
I would have rated it higher in fun & education, except that I think a lot of people will lose interest fairly quickly.
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If you are an engineer or scientist at hear, this will intrigue you for at least a day. I have noticed that people who have no interest in how things work don't understand or care about this amazing piece of plastic or the history behind rattlebacks. The unexpected physics behind it's subtle shape is ineresting in it's own right. It is also a kind-a of phycology test. If you are intriqued by it, you should persue a carreer in the sciences.
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