After my H20-100 developed a high pitched whine when plugged in and I sent it back to Directv, I connected a H20-600 in its place. Found that with the SL3S when I step through channels 247, 248, 249, 250, 251, 252 etc, most times when I go from a MPEG4 HD channel to an SD channel, the video takes a long time to appear. The info banner appears right away but I have a black screen for 10-30 secs, then the video appears. Often when I enter "250", I get various messages such as 721 and 727. Even had a "buy now" pop up but not sure what channel it may have switched to. When I revert back to a 5LNB, WB68, and BBC all is good. Channels switch very fast and video is quick. When I then go back to SL3S configuration, the delays and occasional error messages appear in the 248-254 range of channels. If I just let them sit there for up to 30 secs, the channels appear normally. I realize the H20-600 is old but thought I'd report this anyway.