You know I've never flown KLM, but I've flown through AMS Schiphol which is by far one of the world's best airports. So clean, so modern, comfortable, large, airy, and friendly. Very safe too, lots of police I remember. So they have a striking advantage there. I'm a big fan of the Dutch people and society (very tolerant, friendly, warm, and gorgeous women), so if the airline is anything like that, than its got to be first rate.
This winter I'll be in Amsterdam for a week, and while low-fare is the most important element of the carrier I ultimately choose, I'd look forward to KLM. I'll probably redeem FF credit on DL, even though those batards stuck me up in AMS for about 6 hours 2 summers ago becuase of a late arrival from Kennedy. But at Schiphol it was great!