Dont know about the picture quality of the 7700 but the picture quality using the 7710 is excellent!!..at the moment i'm using a diablo cam and the hd channel's are gr8..the only downside is the 5000 channel storage space..also found i could only update new firmware via a usb memory stick [no great problem]..took a little time getting used to this rx [after using a toppy/echo/ect.. but well pleased with it now.