Pros
I find it to be fun and I love taking care of the animals like they're my own pets. Coworkers are nice, Supervisors are nice. Just follow the rules (they're pretty lax just don't be stupid) and you'll survive. The work itself isn't too hard, it can be challenging at first but it gets easier with time. Treat the animals with love and attention and keep up with the paper work side of things and you'll have no problems.
Cons
Base access can be a problem. The work is physical and depending on the species it can range on the amount of animals you work with, and depending on the day you can be scrubbing or sanitizing rooms or cage changes. The start time when you're starting out is usually 6 am, so if you live further that can be a pain.