I've travelled to / from AMS many times and never suffered a lost or delayed bag. But on the first occasion I transferred there, en route from Edinburgh to Geneva on a ski trip, my bag including all my ski clothes was delayed. True to their word KLM delivered my bag in a taxi to Verbier at 1130pm the same evening but ever since then and having read so many bad experiences about AMS I vowed not to trust the baggage transfer system there again.
So when I flew to Tanzania via Amsterdam this summer I asked the checkin agent at Edinburgh to only check our bags to AMS. We went through passport control, picked our bags up and checked them in again for the leg to Kilimanjaro. A bit more hassle, but it was worth it for the peace of mind. Obviously it wouldn't work if you have a short transfer in AMS, but otherwise it's worth considering...
13Alpha