The product is intended to prevent overcooking. Depending on the size, it is suitable for small size pots. I bought an original of the company "Koch Flower" and must say that I am completely satisfied with the product. A boiling over of water, even with well-filled pots, is prevented by the flower. It's easy to clean and processed dibasic. Add to this that it can be extremely space-saving stowed in the closet.
However, price / performance could be better, in my opinion, after all, it is indeed only a little silicone.
Still, I give it 5 stars because the idea of this kitchen help is just awesome.