It's amazing the arguments I read to justify not having a mirror. I read the same logic on motorcycle forums about helmets. So someone tell me how not having a mirror is safer than having one. Driving, riding, flying are all the same. It's all about situational awareness and integrating your own position and plan with those around you. Hard to do that with a 180 degree view instead of 360. As the fighter pilots say, "Check six." (Six o'clock)