I worked at TestAmerica full-time (More than a year)
Metals department was great because EVERYONE on the team was intelligent. We could seek help from each other, even though we each maintained and prepped/ran samples on a different instrument.
The Employee Handbook explicitly states that employees may wear a phone/mp3 player for music, as long as one ear is always open to hear the lab.
The pay seemed low. The only way to make money was to work overtime.
Then, there is forced furlough when there are so few samples to run -- sometimes we might work only 3 days a week.