1 - They are so dark that when driving you cannot see your dashboard at all.  I have to take them off to see what speed I'm going.  Never had this problem so extreme with sunglasses.<br /><br />2 - every time I look down even just slightly they fall completely off.<br /><br />I had bought them for my husband but after he complained of these same two problems I bought him different ones and used these for myself thinking he was just being picky but nope.  For some reason these just fall off when other aviators don't.  So I have to take them off to see my speed while driving or make an adjustment on the radio or temperature making them close to useless.  If you don't need them while driving, don't need to see when in the shade and don't need to look down then they should work fine for you.