They do their job... the only thing I'm afraid of is whether they secure the belt equally well in a potential collision... I hope no one ever has to test it.

The product is good. It works as expected. However, the slot for the belt is smaller than expected and cannot accommodate all the buckles circulating in cars. I noticed the same with other similar Chinese products. Either the Chinese have different standards for seat belt buckles or... I don't know who is "improvising" here. The result, however, is that you cannot be sure by definition that it will fit your car. It did not fit in Opel Astra G.