I'll tack onto this, with the following :
Model = KDL-40NX723
Connection = Wired CAT6 to router - Get stable 16mbps internet connection
Problem = When using the red button (MHEG-IC services) on the 4Music station it appears to freeze the TV for about 1-2 minutes, then all of a sudden it software application runs enabling you to choose which video stream you want. When scrolling through the video streams, the application appears to freeze again, with another 1-2 minute wait. You cannot do anything when this happens (ie change volume), but wait - or switch TV off. So for me - It works, but very very slow.
