The Stirling engine model kit arrived in a pristine box, every piece well wrapped. The parts were well-built and fitted easily in place. The instructions were very clear and easy to follow. It took less than two hours to build the model, but another one was needed to find out the fine regulations that made it work. These regulations helped in understanding its functioning.
When it started to twirl and move, the magic began: it was almost hypnotic to watch and it was very satisfying to see how a faint flame was converted into electricity.
A very enjoyable gift.