You'll learn a lot, but...
Pros: great work experience, wide range of mental health exposure
Cons: low pay, large caseloads, horrible management, questionable ethics, at times hostile work environment
First off I learned a lot, but it wasn't worth dealing with management that could care less about clients and care too much about making money. Speak up and they will make it hell for you until you finally give up and quit. But get in there, learn, and keep it moving.