Unit worked for about three months, and went dead! It had a beautiful resolution.... Until it died. The unit DID NOT have an English instruction booklet. Luckily, I was able to return the unit, (got Amazon involved, and they are ALWAYS GREAT). I have to admit, the manufacturer was good enough to pay for return shipping (to Korea). The price reasonable for this 30" monitor. I wound up buying a 27" Asus for about the same money. So far, the Asus is fine. I recommend always buying an extended warranty