After about a week with my new 750, I must say that it is great. I like it tons more than my 71f. However, (puts flame suit on) I too am noticing a really large delay, sometimes it seems as much as half a second between my audio and video. It seems to be the 120hz processing that seems to be the culprit, when i turn it off the lip synching effect seems to be minimized. On high, the audio delay is really noticable. I have my tv fed by my STB via hdmi. When using my old workhourse receiver, an old Denon 3300 ( no hdmi) the delay is still there. I do not have any way of delaying the sound to the point where it matches wahts going on on the screen. Do you think samsung can fix this with firmware? perhaps make another screen in the menu with a sync adjustment? Its really aggrivating. Other than that. I am one very happy camper- but i really would like to have this taken care of. I know someone else had this issue a few weeks ago. Did they ever get it fixed?