I had very pleasant experiences in FRA and MUC last week signing up for and using easyPass. I am an American and was flying ORD-FRA-PRG with a 4-hour layover. After landing in FRA, I made my way to the Bundespolezei with the paperwork filled in, arriving at 6:30am. The sign on the door said they open at 7:00, but there were two officers inside. I stuck my head in and asked, "When you open at 7:00 is this the office I go to to sign up for easyPass?" The officer smiled, waived me in, and entered my info into the computer. About 2 minutes later he thanked me, and I was on my way to the gate.

I flew home later in the week MUC-ORD and I used the autogates to enter the terminal. Although there was a long line for the "regular" passport control. I was the only one at the autogates. I scanned my passport, smiled for the camera and the gates opened up; The passport officer smiled, stamped my passport without asking any questions, and I was on my way.