Apparently the goods have quite a large percentage of marriage. I recommend checking at least the operation of the propellers, which is called "on the spot".
Pros
Convenient modular system, high-quality plastic.
Cons
At the first test turn on, it turned out that one of the four propellers was not spinning.
Some pros:
Inexpensive, yes, camera, relatively easy to manage
Its cons:
Too simple for the street - it blows away with any wind, but too big for the house