I have had this TV for 3 months. Initially I had a small amount of flashlighting in lower left corner..... Samsung said to turn down backlight to 7. It eventually went away.
Picture is great. I am running sound through my 5.1 sound system because it sounds much better. I have used the HUB browser every once in a while, not enough to pay for a separate keyboard. I don't use voice or hand motion controls. 3D works great.