Don't have them and have not even thought about it until I read this thread.
The standard lights look good and are perfectly fine for night driving. I live in the countty so no street lights and lots of dark lanes.
I might upgrade the bulbs for £20 but that would be reluctantly.
Such an expensive option that I would hardly use anyway so a no brainer.
My ML has xenons with the cornering feature so I am fully aware of how much better they are than normal lights but there is a limit to to what I will pay for what is in effect a couple of brighter bulbs. I mean £1800 !!! and yes I could have afforded them as well.
Could not justify the leather option either, that was over priced as well.