I greatly perfer the speed and true 30 sec. skip of the 722, but there is one feature in particular that makes the HR20 series a must-have for me. Maybe I don't know the correct terminology, but I don't see it listed. When both tuners are in use, and you have back-to-back recordings, the HR's maintain all their record paddings (start early / end late). The 722's can't do this. With shows ending late (especially ABC), the end of all those shows get cut off when using a 722 no matter how much end padding you set up for your recordings. It is a huge problem if you do a lot of recording and need both tuners simultaneously.