Welding Helmets

O.k. Serious question from a fairly new welder. I love my welding helmet and have zero problems seeing what I am welding and the auto darkening seems to me to be instant. I have never felt like my eyes are being "flashed" and after welding for several hours at a time never feel like my eyes are bothered at all. I have an Eastwood helmet thats about a year old. That being said, I like my vision. Is there really an issue with my helmet that I am unaware of? Am I really slowly blinding myself with my $70 helmet? I ask because I like mine and have zero problems with it but if the tradeoff is burning my eyes up I will go drop a few hundred dollars on a helmet.