I was adding the third dual and it said online in menu-6-3-connection and online connected in menu-6-1-9-1 and it could get the "name" of the receiver when setting up but it would not get past the connecting bar. My son reseated the connector (his-to-use 622) and it then worked. The phone-like jacks are fairly reliable but either a pin was lifted or shorted--so it wasn't the cable nor the second switch between the DSL and the 622.
A note, you can set up "n" receivers but it only displays information from one at a time--the one you will be setting. Would like some way to see/set the schedules of both 722s as one.
That said, the display is easier to use than the receiver itself except conflict resolution is sometimes better done on the receiver because you can see the list of events nearby. It could use a little longer timeout because I need more time to look up the shows before deciding or just reading boards.
The star counts there are slightly lower than on the Dish/Tribune's info. For now my interest requires 2+1/2 on Sling and 3 for Dish. My initial load was so big I have been requiring 3 for Sling. My current cutoff is about 7.6 on IMDB civilian rating--on average 4 stars above Tribune's critics.
-Ken