I have used GE a dozen or so times at JFK, IAD and SFO. This past Saturday I used it for the first time at ORD. Kiosks well-placed and process smooth. When I got to the CBP agent at customs and handed my printout she looked at my passport and asked where the sticker was. I showed her the sticker and she said "welcome home..." I haven't been asked for the sticker before, but this makes me think that when I get my new passport later this year I will not only update online but will also pop into the office at JFK and get a sticker in my new passport...