I have used GE 4 times, all 4 I got an X. This last trip they sent my to secondary screening.
The officer asked a lot of questions. Then he asked for my cell phone, asked to unlock it and to return to my seat. After 15-20 minutes he called me back and handed my passport and phone, just said 'you can go'.
He opened text messages, contacts, file manager, chats, photo gallery (still open). Don't know if he looked at something else.
I saw people from my flight already after the check point and I had to wait 15 min line.
I may try the 'regular line' next time, to see if the officer ask me many questions and/or send me to secondary again.