I have read the other mirror threads and the one about the aftermarket glass. I can't imagine not liking the aftermarket glass that is slightly convex, but some people say they do. I am in the boat that hates the flat glass and has trouble seeing out of it. I guess it's OK to see the other lane while driving, but it's extremely hard for me to back up using it and hard to see a small trailer in it. I have read comments that say people have trouble with them because they aren't adjusted properly. So before I buy the aftermarketet glass, can someone explain how to properly adjust these mirrors? I mostly look into the small convex mirror when backing up or to make sure nobody is in my blind spot. These mirrors must work if they have made them for so long so I want to know how they should be adjusted so I can give it a try. There must be some advantage to this flat glass, but I sure haven't found it yet.