I would add that the 722K does have a different (better) chip inside. I can also say that I noticed a PQ improvement with the 722K, while the 722 looked a bit "softer." I'll also add that our HWS's have a slightly better PQ than the Hopper 1.0's we had. I suppose each new gen of Chip may help with processing PQ, IMHO. Interesting how, to my eyes, latest chip/box generation seems to improve PQ.Unless you live within 30-40 miles of your local station broadcast towers, you won't get much if anything OTA. Aside from OTA, 722 and 722k are effectively identical. IMO 1 vs 2 OTA tuners isn't a big deal.