Mileage may vary from person to person.
My DS Lite is still ok, but maybe because we're all extra careful because it's only supported by one hand (the other hand on the stylus for most games). My rant on the DS is that when on bed, I can't play lying down or my left arm will hurt as hell. I have to sit up to play.
The Wii is one sturdy machine. It's pretty cool, too, so I don't think it'll ever overheat. We bought one of those Wii bags whenever we need to bring it over to my mom's place. I don't think it'll be breaking up anytime soon.
On the PSP, I've had some problems with the X button as it doesn't respond like before. The analog stick is somewhat screwed, too, as if it's not centered properly. Someone told me to calibrate it first before trying to replace it. It was reduced somehow, but problem still persists especially with games that have very small deadzone.







