I love my 722. It is the most influential reason I chose Dish. SD looks just fine on my 46" Samsung LCD. Much better than when I had TWC. I just wish HDMI worked with my set. It (the TV) is a bit finicky, but it works fine with PS3 and AppleTV, so I put at least part of the blame on Dish.
I would like to replace my 625 with another 722, but I would have to buy an HDTV for the bedroom, and we just don't watch enough TV in there to justify the investment.
Ted
Two things, I had my 622 hooked up via s-video for the HD channels before I got a HDTV. No problem it displayed them fine. If you want the HD channels where the 625 is I'd go for it.
my 622 (knock wood i doesn't hear me) has been fine, good interface & features especially using it with a EHD. Easily the best Dishnetwork DVR. I still use a 721 and a 7100 (upgraded drive) and had 501s. The 721 dual tuner and decent storage and decent interface but slow. 7100 Nice interface and slow.
I've been tempted to get a 722 to replace the 622 using the EHD to move things over, Then replace the 721 with a 622 on a 27" SDTV. That'd give that set access to the HD channels and a better picture on the channels that have SD & HD feeds.