About OLED/AMOLED durability
I had a Samsung Wave for four years now. The display broke off in a corner, and the glass broke apart in two streaks. It didn't shatter, though, so that's okay.
The display is still crisp, and I still have it at the lowest brightness, which is more than plenty. At maximum brightness, it's reasonably good in the sun and way too bright for indoors.
However, I have three qualms with the display: the black isn't black, evenness isn't even and burn-in happens.
When supposed to display only black, the screen still is lit, if ever so slightly.
Worse still, there are splotches visible (clearly visible when it's pitch-black around).
Third, burn-in happens. Around the top and bottom of the display (status bar and basic icons), the burn-in is clearly visible even at mid-brightness (it's obvious when completely white).
That said, the phone is still usable after four years (to an arbitrary definition of 'usable').