I have not messed with it in about a month but I remember it being very slow loading. Also, if I was to tune one of the programs in the bottom right box, current popular programs or something, it would always tune to the program in SD.
Let's say you tuned to a show that happened to be on the Discovery Channel by selecting the show in that "popular" box by highlighting it and pressing "select". It would tune to that program but it was in SD. It even had the networks SD channel logo in the info bar. If you manually entered the channel number it went to the HD feed like it should have in the first place. I thought that was kinda strange since the HD and SD channel numbers were the same, it just chose to display the SD version.