+1 to KLizzotte. Mirrors FTW. I feel blind w/o my Take-a-Look mounted to my glasses. Considering adding this to my handlebars as well.
As for makes/models that make me cringe… big black SUVs, especially those that are some federal or quasi-federal security something or other. I’ve actually had a couple try to reprimand me to taking the lane and even got buzzed just yesterday coming back from lunch here. Cars parked on both sides of the street, me about to turn left to enter my office building, driver floors it to squeeze by on my left side and accelerate up to 35 or 40, just to slam on the brakes at the stop sign at the end of the block. No siren, no lights, no nothing. Just pure assholery and threat to safety of all on the block. Not at all atypical for this type of vehicle around here, thus my response.