Just before Samsung launched their 3D range of screens, they promptly sent out a release warning of the dangers of 3D to your health. They have to legally to protect themselves from and issues caused which by now you should know of. It can cause nausea, confusion etc. Sony buried warnings in a manual somewhere that comes with your new Sony screen purchase.
Sony have said that 3D could even help you be a better gamer, and while I do see their points and it looks so damn good, I am not convinced it will make me a better gamer for one fundamental reason.