This is my first OLED device (as far as I know! lol) and in doing a little homework I've seen the phrase "mura effect" tossed around -- seems this boils down to a common issue among OLED screens. Last nigh I was playing the Vita in my "man cave" which is rather devoid of light. Playing Uncharted for the first time, and during load screens which are rather dark I noticed tons of black blotches and streaks on the screen. It was late, thought my eyes were playing tricks but sadly they were not. To test all you need to do is be in a very dark room and look at a very dark background on the Vita. Ideally you want to look at a part of the screen where nothing or very little is actually rendered -- like a Uncharted's loading screens, or the "black bands" on the left and right sides in the camera app (when not in fullscreen mode). I tried to take a pic of this effect but it's pretty tough to do. Googling around yields some interesting threads. And here's a pic. This isn't mine, and this pic has been enhanced to show what the spotting looks like: (edit: forgot to post the source of the pic!) Overall I'm loving this device, and this "issue" is really minor IMO.