I got Global Entry specifically because of Dulles. I arrived there today at about 3pm from Narita on United. There must have been at least 5 other flights there. I saw signs for Heathrow, Mexico City, Brussels, and a couple of others I can't recall. The line backed all the way up to the escalator. Nevertheless, there was someone (don't know if from United or CBP) standing at the bottom of the escalator directing Global Entry members. Zipped up to the kiosk, no wait. Only 2 of the 4 kiosks were open and the two working ones failed while I was there. I got timed out because it couldn't read my prints. Grabbed my receipt, hopped over to the crew line (which was basically empty). The CBP guy was nice as could be and boom I was on my way to get my bag. Grabbed my bag and headed over to Customs. Ran into a friend who was transiting Dulles (from Brussels to LAX). He's not Global Entry and he had already been there 2 hours. Said goodbye and headed over to the Global Entry side of Customs. Officer took my receipt and off I went to the crushing reality of baggage re-check and TSA re-screen. Still, there's absolutely no way I would have made my connecting flight without this service -- I had almost 2 hours between flights.