Most Useful/ Useless Car feature

[*bfine32*]

Dog's thread about his HUD got me thinking about "useful/useless" car features. So I wanted to get folks' opinions on what they found to be must have and an IDK (or even annoying) feature.

I'll throw these out

Most useful: I've got to have heated seats. More for the back than the bum

Less useful (annoying): Auto shutoff. I used to take my car to the shop if it quit when I stopped; now I have to pay extra for it.