I was just at the Paris Marriott Champs Ellyses for 4 nights using award points. I checked in at 9am, I thought I might have to wait for a room to be ready because I did not inform the hote ahead of time, but they were able to check me right in. The front desk person was very appreciative that I am a Platinum member and said he had upgraded me to a tri-level room facing Champs Ellyses and that the hotel Guest Relations manager will show me to my room. Even at the US properties, I am always at the JW hotels, they definitlely appreciate your patronage as a Platinum member. ^

It is definitely worth it.