My DS Phat's top screen came off in 2009 after having it since launch, got a DS Lite to replace it and the same thing happened to it in 2013. I had two original 3DS and the shoulder buttons on both died (I bought the second because the first one's shoulder buttons died, too T.T) I also had the reset button on my Gamecube jam, but it didn't affect function, it was just permanently down so I could reset using it.
Outside of that.. I've been pretty good. I don't know what happened with the DS hinges and 3DS shoulder buttons, my GBA SP is still in one piece and it's shoulder buttons work too.