I just changed my shitty SDTV for an HD one, and the difference is huge. On my old TV, I had a lot of trouble reading the text in games like Mass Effect or Assassin's Creed since it was so tiny. It was also a mono speaker, so whenever a character to my right started talking, I had to rotate the camera to hear them, since mono sound is no longer an option in any current gen game I've played so far.