I was scheduled for an HR2x and AM21 install on 8/19. The installer showed up without an AM21 and he said they have never had them and said you have to get them directly from DirecTV.
So I was quite irritated with DirecTV at that point knowing I would have to leave the HR10-250 hooked up until the AM21 came and then switch all the cables around to the HR2x - gotta see the Olympics!
Well, after the installer got the dish up, when he was hooking up the HR2x, he went, "Hey, there's an antenna input on here!" He looked at the box and noticed that it was an HR20 and remembered that they had just gotten a bunch of those in.
So I was torn between being happy that I wouldn't have to wait for an AM21 and move a bunch of cables around when it came and wondering about getting a 2 year old model. So now I'm glad to see that I'm not the only person having a 2 year old models installed!
Anyway, after 3 days I have had no problems and am very happy with the HR20-700.