The 6000 is OK, . . . given all the items discussed already. It really is an older technology receiver. I recently upgraded my last 4000 to a 508, and now I notice that the picture on my big screen from the 508 looks much better than from the 6000. I am using component output of the 6000 and the SD picture is being upconverted to 1080i. Seeing one of the above posts that you should use the S-Video output for SD broadcast may now explain this. I assumed it might be newer technology in the 508, . . . but it may simply be that the 6000 does a poor job of upconverting the decompressed SD signal to 1080i format (hence why the suggestion to use S-Video for SD shows). HD looks great, and the OTA works really good if you can get a solid signal. As mentioned, it is a bit noisy.
One real big PITA for me is that the 6000 can not output HD and SD at the same time, . . . the 811 is suppose to. I have a single media rack and send my 2 receiver outputs (plus DVD and VHS) through a whole house distribution system. So, . . . when the 6000 is outputting in 1080i, I don't get that video broadcast anywhere else in the house (I do get the audio). If I switch to SD output mode, I loose the video off of the composite cables, . . . which mean I loose video from my wide screen (I know, I could use S-Video, . . . but I already have a number of components hooked up and don't want to double up from a single source).
This all forces me to basically use the 6000 solely for the theater room and the 508 for the rest of the house, . . . which cause new problems. I really am down to 1 channel for the ROTH, . . . and if I am watching a local digital station on the 6000, . . . there is about a 4 second audio/video delay between the 6000 & 508 (due to transmission from the local to Dish and then back to the 508). So, as I leave the theater room (to go to the refrig or bathroom), and the channel is on in another room, it gets a bit annoying. This really gets annoying when a sporting event is on and you will hear the cheers from one room first, followed about 4 seconds later from the other room. I've lived with it to get HD, . . . but can't wait for the 811 to start shipping so that I can get both HD & SD outputs at the same time (and I am assuming they will be in sync). I am also hoping that with the 811 using the newest technology chipsets, that the video for SD broadcasts will be as crisp as the 508, even after the upconvert.