All kinds of machine go through PDI.
What I learned is that: There's always an space for us to learn new things that would or might help us one day.
Well, not all managers/co-workers are the same I guess but one thing I like about is that they somehow respect foreign workers.
The hardest part would be the winter time where you don't have a choice but to come to work and do your job.
The most enjoyable part of the job is when you are ahead of the time required to finish the job.