I have STX-RC from 1995- I neglected it as kid and it runs like crap
I have Ultegra - 9speed from 1999. I've wrecked the snot out it and abused it. It still works but runs like crap. I need to replace it.
I have Dura Ace 7800 from 2008. It's barely been used until a year ago. It runs great.