The second is to be able to record 4 things at one time like a 722k does.
I guess you didnt see the one thing he wrote
I have 5 HDTV's, served by a 722k (one HDTV on TV1 and another HDTV in SD on TV2) and 3 211's all with EHD service.
so if he switched he would be upgrading to HD for all his TV's and not have one on a SD connection