By far the biggest drawback of OLED panels is their susceptibility to image burn-in: this occurs when the same image is present on the display for an extended period of time, in the same position (the HUD on a first-person shooter game for instance) causing a 'ghost' of the image to remain scarred onto the screen, even when you change to a different image. This can be temporary or permanent. The most recent OLED panels are more resistant to burn-in, but it can still be a danger when gaming especially. As long as you take regular breaks between games though, you should be alright.