I booked OPO-AMS on KLM website last year and was able to put in my QFF number without issue and select seats [USER=62445]@Port Power[/USER] [USER=93218]@05flyer[/USER]
QFF points came through day after the flight - no SC's as per the calculator.
Interestingly, at online check in, offered upgrade to J for €119.
As I had injured my ankle, thought "what the heck" and accepted the upgrade.....then realised it was only for one pax, Mr Flyfrequently was still in Y 
Lined up at checkin anyway and snapped up another J seat for him.
