i've worked in a factory as a line technician. it was very boring, which was fine. but what sucked was the hours. split days off, and the factory was running basically 24/7 so if someone called out your 8 hour shift turned into a 12 hour shift. you also might get a call asking you to come in 4 hours early to cover the other side. lots of ot, though. it paid well.
United States