Service dept.
The 2 am callbacks and watching the sun come up. I hate it when I see that fireball crest the horizon from a rooftop working on some damn elevator. (9 years)

Construction dept.
The freezing ass winters and the broiling hoist ways in the summer. (5 years)

Repair and mod. Dept.
only did that for six months got pushed to a route. So didn't stay long enough to find anything wrong.

Oh yeah and company bs but everybody has to put up with that.
Besides that I love this stuff. You learn something everyday. And just when you think you know something. A elevator tears up and whips your ass. So you have to learn even more.