mirror protectors

I had the original Mirror guards on my 09 Nuevo for three years, they saved the drivers mirror three times, however broke in half on the last impact, purchased the Milenco type mirror guards as I was near their Sheffield store, replacing the broken cover.
The Milenco guards are thinner , without the foam pads. The Road -pro mirror armour guards appear to be made of thicker material, they look as if they would survive a good impact.
I have the Milenco mirror guards on my Sigma, however might purchase the road pro ones  if I'm passing a store.
Boaby

An old thread I know, but how useful are these protectors? I've just returned from a whistle stop tour of Cornwall, and driving steadily down a not particularly narrow country road, but with no central white lines, I was faced by an oncoming car driver who refused to go anywhere near the hedge on his side, preferring the centre of the road! I was forced to go dangerously close to the hedge on my side. The NS mirror hit a thick branch and snapped back and hit the door with an almighty bang, shattering both main and blind spot mirrors.
When I inspected the van, the only damage apart from the glass was a crescent shaped black ding on the door just below the quarter light window, hopefully this will polish out, it was the wing mirror hitting the door that broke the glass, not the contact with the hedge. I fail to see how these protectors could have prevented this.
I have two replacement mirrors with heating elements on order, cost of £25, which I think is reasonable.
Al.

Think I get that John. I've had the mirror flick back many times when it's hit overhanging shrubbery etc, but this is the first time the mirror came back hard enough for the frame to hit the van door metalwork. This shock caused the mirrors to shatter. A rubberised rim rather than hard plastic may have prevented it.
Al

That's what I intend to do Steve once I've fitted the two new mirrors. Either that or stick a 3x2 inch block of white high density foam below the quarter light window where contact is made with the mirror when it folds.