Vantaggi
When there is downtime(usually none per shift aside from breaks), it's nice to take a breather. On the bright side, they will "try" to help you transfer your employment to other cities(if applicable) if you move. I cannot speak for other offices as I dealt primarily with Twins City sites.
Svantaggi
Area supervisors and managers give in to clients demands off the contract thus endangering security officers commitment to other duties as well as health. Once you hit supervisor, you are capped unless you have office politics to get you INTO the hiring office where all the "fat cats" gossip. There is also mandatory overtime if your relief does not show up which is pretty much slavery with a wage. People have a life outside of this dead end job.