Three reasons I opted for the LED headlights:
1) They look great and really set the car apart from the crowd.
2) Functionally they are excellent. Nice pure white light with even dispersion and good coverage. I don't find the adaptive functionality that usefull, but I don't often drive in poorly lit twisty roads.
3) I think they will soon become standard fare on cars in this segment. I can see them being standard on the MSport GC at the very least by LCI if not before (LED headlights are already standard on the CLS sport). Therefore spec'ing them now will ensure the car remains looking contemporary for longer.