All of the above. Got mine 2 weeks ago. Mine is set for 1600x900.
Drawbacks -
All your nice wallpapers no longer fit.
You need to change your preview window and render sizes to your new screen size.
Text on web pages is very small.
All your old renders now look small and you wish you could do them again.
Other people's renders look too small now.

Don't get me wrong, I love widescreen and could never go back.