Well, I've been using the Zenith since Friday when I picked it up. I've got to say that I'm thoroughly impressed with the picture quality. The DCDi upconversion of regular cable programming isn't as impressive as advertised, but it looks MUCH better than both the Samsung DLPs I tried. Only now do I realize how terrible the picture was on those Samsungs. Artifacts, what? Seriously, this is the cleanest picture I've seen on a non-CRT HDTV... er, EDTV...
There's still some mild ghosting (very mild), but the picture is rock-solid no matter what I'm viewing. The low pixel count (852x480) makes it rather difficult to use my PC with it and although I can go to much higher resolutions, there are issues with clipping on the sides and illegible text... I'm still working on finding the perfect mode for my PC.
I'm using the Samsung upconvert DVD player, that little silver thing, so it's using up my DVI port... I guess I'd rather not sacrifice my DVI port if I can get away with an equal picture by using component. I'll have to test that out tonight.
All-in-all, this TV has changed my mind about EDTV plasmas. For only $2,200 after tax, it blows the mofo doors off any DLP or LCD I've laid eyes on in the sub-$4,000 range (but I haven't seen them all).