Pros
The experience alone is pretty amazing. I've worked at a very busy large airport for 2 years plus. I have seen and witness some crazy things that I am sure not many people can say they have. Some coworkers can become great friends. The thought of protecting the public can make you feel good. The pay is great when the government isn't playing childish games with your paycheck.
Cons
Every day is a gamble. You can have those days where a psychotic or snobby passenger is yelling at you about the rules. Then you will have days where you bang heads with a moron coworker who is trashy, unprofessional, and possibly insane. You wonder how they hired some of your coworkers. Imagine witnessing 2000 plus people a day squeeze through a small checkpoint with no air conditioning and it is dusty as hell.. oh, and you are the only male or female on the floor giving pat downs all day? On top of it you might run into someone recording you with their phone or taking photos. A passenger sexually harassing you while you pat them down or even looking in their bag? There is no process to report this?