I'll cape up for blind spot detection. My current car doesn't have it and I out-of-the-box I found that I had to move pretty extensively to see things that are to my 5 or 7 o'clock; even with my mirrors correctly positioned there's a gap between what I can easily perceive from the wing mirror and from the rear mirror and I had to buy blind spot mirrors to compensate. (It's much better with them.)

The car isn't even that long--the back pillars and back window are just weird (Hyundai Veloster).