Prós
You learn a lot about Probation and Law Enforcement. Pay is above average, working conditions are decent. There are some options to promote but it is hard because many are trying to promote as well. Some supervisors are awesome and will have your back.
Contras
You end up doing a lot more than you signed up for. The pay sometimes is not enough for what you have to do. As a rookie, you are not treated very well by your co-workers, especially some of the old-school guys. Some of the supervisors are not always pleasant to be around and don't treat all the PCO's the same. You get mandated to work extra shifts. You miss Holidays, Birthdays and other events. You will not have good days off until your 2nd-3rd year Maybe.