Polaroid anti glare over specs?

Sold on Amazon just over £12 polaroid anti glare over spec which can be used over prescription spectacles.
I, as do many motorists have problems with sun glare and night headlight glare. Has anyone out there tried anti glare specs of this type and found them useful and do what is said they do?

My optician would not conform to my offer after telling me how good the anti glare coating is now because I refused to pay the extra having found in the past it did not work.

My offer was for him to put the coating on I test it for a week on night driving and the occasional day sunlight drive, and if it works I will pay double.
He failed to take me up on the offer so I assume the anti glare coating on specs lenses still doesn't work.