Pros
I was a lab employee and it was a privilege to work there. The work that we did was very important and employees treated it seriously. The lab has more accreditations than any other and is very well-respected in the industry. Supervisors in the lab started out as analysts just like us, so they are in touch with what it takes to do the job day-to-day and understand our needs. Lots of opportunities for cross-training in other departments if you want to hone a particular skill set. There's a committee that is devoted to company-wide activities which helps make it an enjoyable place to work. Benefits are comprehensive and competitive.
Cons
The lab is 24/7 and sometimes it can be tough if you are hired to work an off-shift. But they put a shift differential on top of your base pay to compensate for it, so if you can work the hours, it definitely pays off in the end.