Because of my dad’s job, I was a member of the Washington Telephone FCU for my whole childhood. I just remember they didn’t have a lot of branches (which was a pain since my mom didn’t drive). They got rid of the branch closest to our house and the next closest was staffed by the surliest people. They also had crappy hours (like 9:30 a.m. — 4:30 p.m. weekdays and only open until 12 p.m. on Saturdays).
They got bought by Signal Financial about 10 years ago, which has allowed more people to join, but service really hasn’t gotten better. I have a nominal savings account with them still, so I can keep my credit card with them (my first card, so nice history and only 1% foreign transaction fees). It’s a pain at times because you have to call during east coast business hours (see above) and I live on the West Coast now), but I’m still with them.
I explored credit unions when I moved here (SF Fire was recommended) because my beloved Washington Mutual was bought by Chase during the crash in 2008. But moving banks seems like a pain and so far, Chase hasn’t done anything too egregious to me, so I’ve just stayed where I am.