i also have this setup--i have an 811 and 510 on my big tv, and i also run the 510 to my second tv in a different room, so i can watch what i record on either tv and i only have to pay for 2 seperate receivers (instead of a 3rd in the second room) i use both receivers on the big tv depending what mood i am in...the 510 used to look better for SD, now i can't really say i see a difference