Never again. Arrogant staff. Flight crew looked shabby. Comfort level is low. Schiphol is ok but prefer Frankfurt, London or Copenhagen.
The KLM World Business Seats are OLD. Not flat and not as good as the DELTA ones of same age. AVOID the E seats as it feels like coach with people on both sides. Also hard to get up from E seats.
There was no entertainment system in economy class, but it was an overnight flight.
Not to pick on KLM over others, but legroom is desperately inadequate on these and most planes. My wife is 5'7" and her knees ached through most of the 8-hour flight. Seat-back video with good selection of films and games is a useful distraction...but I'd rather take the train.
Bussiness class seats are not as comfortable or spacious as in other airlines, perhaps, service offered is great and food is also quite tasty. Look at the picture to have a better idea about the seats.