KL now has the same miles system as NW. Remember ALL fare classes are upgradeable.
My favorite is that flights on KL/NW can be upgraded at the AMS lounge right before the flight (good for last-minute tickets or if there wasn't availablity). If there is any seat open it will be released because there is not much of a chance they will be able to sell it an hour before departure...
Gold and PE elites also can get free membership in the 6 Continents club (Inter-Continental & Forum hotels) regular fee is $150. This membership also includes Platinum status at Priority Club hotels (Crowne Plaza, Holiday Inn).
Welcome to KLs wonderful world of benefits!
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KLM PE,HHonors Diamond,SPG Plat,PC Plat,SAS Silver