Had a short, first stay Th-Sat using 10k points/night, a great bargain during high season
Pros:
--Quiet rooms (and that's saying a lot considering I was there during summer tourist season
--Very friendly front desk staff
--Got a Gold upgrade (comp'd lounge access)
--Lounge was empty (Th PM)
--MAGC-eligible
--Prompt and courteous shuttle
Cons:
--Lounge closed on weekends
--Shuttle goes ~2 miles on-demand, including King Street Metro Station, but not DCA, so a real PITA if you have bags
--Location is safe and quiet, but too far off the beaten path to be ideal for tourists
--Limited number of restaurant delivery options
If rates are close, I'd go to the Westin Arlington Gateway (Orange Line) next time.