Do you use DishOnline? Do you use Sling-like technologies currently? If no to either one, skip the 922, and buy an EHD for your 722k instead. There are cheaper ways to do either one, if you don't currently do both.
the 922 is not for everyone. If you want 2 tvs linked the the 722 is the way. If you must have the latest and greatest award winning hd dvr with sling the the 922 is the way.