You'd have to poll their members, but I would suspect they are pretty happy. They are well paid, are not allowed to be worked around the clock like Silicon Valley programmers and have a known career path. For blue collar work it's about as good as it gets.
> Is it possible that there are factors outside of unionization that affect how these workers are paid?
Of course, there are tons of variables. But it's a fact that unionized workers make more than non-unionized workers in the same jobs, that unionized workers are much more likely to have health insurance, that unionized workers are much more likely to have paid vacation and sick time, etc etc.
