Booked the "Park, Stay, and Go" package through the hotel website. Price worked out to be cheaper than parking for a week at IAD. The shuttle leaves for the airport on the hour. Even though it is very close to IAD, you should note that the drive time in NOVA/DC traffic is still 30+ minutes in peak traffic periods.
The hotel itself is by far one of the nicer Hampton Inns I have stayed in. The room was very nicely decorated and spotless. Front desk staff were very friendly and helpful as was the shuttle driver.
Would absolutely consider it again if I am flying out of IAD.