Have bought a pair of these as they look very good but acknowledge they are cheap so plan to test them with a mate who is a good shot with an air rifle! He is calculating pellet velocity over distance so we can try and simulate a 70mph hit from a .22 pellet which is similar in my mind to a hit from a small stone at speed. Doesn't cover every eventuality but interested to know just what happens. This is clearly not a scientific test and not to be relied upon for anyones safety! Wonder how it will go!
