This is our second time staying at this property and we will no doubt stay here again when flying out of Dulles. The main advantage to staying here is the Park & Fly package. You get 7 days of parking including in the price of your one night stay. On our last trip if we decided to use long-term parking instead, we would have spent more on parking than we did for the hotel room.
As for the free shuttle bus, we had no issues. We left the hotel right on time and upon our arrival home we waited at most 10 to 15 minutes. And that was at 11:30 at night. As for the other reviewers having a problems waiting for the shuttle, spend a couple of bucks and take a taxi.
If there is anything negative to say it's that there are no good dining options close by, but that's not really something the hotel can do anything about. Leesburg Pike is just a little over 10 minutes away. Plenty of choices there.