Pros: Relatively well managed
Cons: Lots of night shifts
Not the best employer I've ever had and not the worst either. They're OK.
Security work in general is relatively easy to do. You will usually start off as a floater (fill in for other guards). Permanent posts will be advertised on the company's job line and you can bid on the post offering of your choice. Selection of guards for the post is based on seniority and qualifications.
Bare in mind this is shift work, and guards with higher seniority will obviously choose the nicer shifts (days, evenings)