Just to be clear, Clear doesn't advertise that they take you to the head of the metal detector line, just the head of the TSA ID and ticket check line. They may have an informal deal with a local TSA team that gets them that, but that's not something you can count on. I've never had to wait more than 5 minutes in the line to have TSA check my ID even out of all the NYC and DC airports which I fly out of all the time, so Clear really isn't worth the time it would take for me to sign up, even if it was free.