Well to start the HR20 or HR21 with AM21 cannot use more than 2 tuners at once this drives me insane when I need to DVR 3 shows in similar time slots during the fall/winter.
Secondly HR20/21 cannot do Dual Live Buffering.
30 Second skip (I don’t mean the 30 sec ff where I see the video 30 sec skip it just doesn’t show all the crap)
I am fairly certain series recordings don’t differentiate between first run and repeat episodes.
Another thing is I read the HR20/21 still suffer from the problems I had with the R15 when I had directv in that the trick plays and grid navigation and remote response are all laggy.
Another thing is the upfront cost DirecTV asks for ontop of the AM21 cost for OTA since not all locals are in hd yet and the contract irritates me.