Salut Raphael, hello everybody.
I for one would say that if Bangood is taking the risk sending it to someone for review it shows that they are quite confident the product is going to please but in this case the video also speaks for itself.
These are toys that allow entering the steaming hobby without spending too much, giving access to more people.
I brought a little engine of this kind to my then 10 years old nephew in Greece, a few years back, and I thought that we would have fun during an hour or two. It ended up starting a passion for him and every time I visit him I bring him something more complex. The way he takes care of his toys indicate that he really loves them. I am so glad he can get his nose out of his PC/Tablet/Smartphone from time to time and get his hands on something real, fuming, burning, making noise :-)
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It is great to see your young nephew has taken such a keen interest in his little mechanical marvels.
He is fortunate to have you in his family on the supply side!