Well made for the price. Worked perfectly out of the box. Expect to waste many hours of my life being mezmorized by the simple and elegant motion of this machine.
Very interisting kind of Stirling. Very beautiful of the theory of this ecological engine. High quality manufacturing and material. Fast shipping. All satisfaction with this purchase.
We love this little device. Ostensibly, I bought it for my engineering-minded (and steam train-appreciating) 7 year old, but to tell the truth, I'm strongly considering buying a second one for my office. My kid likes to put it on top of a tea mug and watch it go, and talk about how it works. And I do the same with mine. It's great to talk about the basics of steam engines, pistons, wheel drivers, gravity as power (why is the thing on the axle a different shape instead of a circle like the wheel?), and temperature differentials, all over a cup of tea, hot or iced.
This was bought as a gift for my husband and it works fantastic! Also very nice looking.