My experience with EasyPass is this.
I enrolled at FRA but the computer was down. The officer took my paperwork and said she would enter it when the system came up. She also stated that once entered it would be effective within an hour or two. Thirty days later I am passing through FRA and try the EasyPass gate and it wouldn't accept my passport. I go back to the Police station and the officer verifies that I am enrolled. He examined my passport and mentioned that I have one with extra pages and that the info page may not be scanned because it doesn't extend to the full length of the cover.
Since enrolling I've been through FRA at least 6 times and have never gotten EasyPass to work. I will say this, the gates are confusing as it is hard to determine which one I can use.