This one-year membership to Clear was a most pleasant surprise when I saw it in the Platinum Member booklet they send us and boy am I glad I looked through it and saw it.
My primary airport is San Jose, CA and they have an amazing Clear system for both terminals at the airport. I signed up for back at the end of June, got the card mid-July and have already used the service this past Monday and the Monday before that. I usually get dropped off at the airport and from car door to the gate has taken an average of about 13 minutes using Clear.
If you have the opportunity to sign up for it, do it quickly. I don't know if I would pay the $100+ annual fee that Clear charges but I do know I will take advantage of it at least for this year. San Jose is one of those airports where you never know what type of security line you are going to get on a Monday morning or Friday afternoon/evening. Could be 5 minutes, or could be out the other side into the parking garage (Terminal 1). This is going to spoil me rotten knowing I can show up to the airport about 45 minutes to an hour before a flight and still be at the gate without breaking a sweat.
Just be prepared for some evil eyes from people who have to wait in the lines themselves. Most people contend it isn't right to pay for this privilege of just getting to the front of the line. Keep in mind you still have to scan your bags and still have to walk through the metal detector. This is just a free pass to get to the front of the line.
Hope this helps,
I've seen the offer, but declined.
Personally, I don't believe in paying for "better" treatment to solve a larger security problem.
Moreover, I the Clear system still has many security gaps of its own. See recent stories.