Pros
Good, flat pay Interview likely involves 0-1 questions and you're hired on the spot. I held the most important position at my location and the only question I was asked was to explain "something interesting about explosives." Easy work. You might get a nice jacket, 2 polos and 2 khakis if you complain hard and long enough. You're most likely to get whatever sizes they have in stock and to wait months for the next shipment. The polos are poor quality, so don't look forward to that too much.
Cons
There is no compensation for emergencies: hotels, parking, you name it. If you've got to show up at a certain time you've got to show up, or you're likely fired. You're likely to be vilified if you have liberal views. Because people have little to nothing to do, and the company doesn't provide a reason for good work(bonuses, benefits, pep talks, nothing), you can expect a quality of work that is in line with the fast food industry. Don't work for MSA if you have pride in your work, lest you're spoiled. Benefits are non existent. You're working here because it's easy, good money. Period. They like to hire retired cops exclusively, but sometimes they'll pander to military veterans. Don't talk to HR. You'll be singled out and fired at the next opportunity. Talk to your friends at the job, instead. Want to branch out to one of MSA's numerous other job opportunities? Good luck, I've only seen people who are waiting on their 'applications,' which amount to e-mails back and forth with someone you hope can hook you up. Someone's got to take your current position first.