Very reasonably priced parking at Dulles and just as good as any other lot offered. Outdoor lot, but nice area. Very easy registration...quick check in at the desk and park your car. I particularly appreciated some flexibility in their pricing. I've parked in lots that have charged for an extra day when I wasn't back at the exact reserved time because of a one hour flight delay; this lot isn't that rigid. No complaints...I'll park here again when flying out of IAD.