They seemed less reliable than LEDs. When they were common here they would always have tens of dots stuck in the wrong position.

I'd imagine the vibrations didn't do them any good

Interestingly, I've never noticed any stuck discs. I'm pretty observant of them as well, because I think they're so cool.

The ones here could have been nearing the end of their life to be fair. They have basically all been replaced with LED signs now.