As an aviator I was interested in buying these to replace a more expensive pair that were damaged.  The problem is they are way to dark unless you are in full sun.  When in full sun it is hard see through these glasses. Around the edges you get a lot of sun pouring in so that your eyes can not adjust properly to the dark center.  Also if you are a pilot and looking outside and then look down at your instrument panel you can not see it. I an sure that some will say you get what you pay for and they are right.  In this case though they may look cool, but do not drive or operate any equipment while wearing them.  You will have a hard enough time just walking around not bumping into things