This is a very timely thread.
We are returning from Europe in a couple of weeks. The original itin had us leaving CDG at 10:30 AM, so I worked it to overnight in Paris - now they changed the departure to about 1:30, but I had already booked the Hilton at their summer promo rate.
Looks like we'll have more time to enjoy the lounge with no rush in the morning. Glad to see it is a highly thought of property.
BTW, the last time we did this, I used one of my free night certs from Marriott and stayed at their hotel at CDG. Has just been upgraded to full service with lounge and all, and it was very nice. It can be gotten for a few euros cheaper than the Hilton, too. My choice would depend on my status with either chain.