Cornering lights ...

I like mine, and I like the look. I first saw them on a Merc a few years ago and thought "ooo clever" They're nowhere near as good as the adaptive lights which move when cornering and if, like me, you have Xenons, you'll have a job actually spotting the extra light - but it is there and it helps me a little when negotiating the super tight and dark tunnel I park my car in.

On the reversing side of things mine do not illuminate at all when going backwards.

They are activated at low speed by turning the steering wheel or by indicating (useful for roundabouts this as you are mainly turning the opposite way you want to steer whilst going round of course)