Every union I've been a part of has been more of a pain than its worth, or has tried to keep individuals from become any more successful that others. I don't understand the obsession with them on HN.
Had I any dependants, I'd definitely stay (just for the benefits! which cost nothing-more for one dude or an entire family).
Started my own residential shop, now-retired; life probably would have been easier had I stuck with commercial, instead.