Used the GE App at JFK T4 today. Other than the GE section being on the wrong side of the terminal from where I deplaned, I by passed the GE Kiosks and waited in a line of 2 to see the agent. They looked at the approval screen in the app and sent me on my way in like 15 seconds. (FWIW about 5 or 6 or so Kiosks were available if one hadn't used the GE App).