Just got mine. I second most of what's been reported. Not a very feature-laden or user-friendly little beast, and the art direction on the box is hideous, but it works just dandy.
The only cautionary advice I can add to what everyone else has said is that the Sansonic's RF modulator is noticeably inferior to the Zenith's. Smudgy color. Makes it look very VHSey.
On the other hand, video via the RCA jack is lovely, pretty much identical to the Zenith. The Zenith blacks out a bit of the side edges when letterboxing a widescreen station for some reason (not that you'd notice it if your set was properly overscanning) so the Sansonic is a bit superior in this respect.
I don't see the previously reported distortion/lines.
Sansonic's audio is superior (and it would just about have to be).
Of all the available DTV channels in this market, only one is an iffy catch - a low power VHF that's got a null pointed straight at me. The Zenith got it in a teeeeeeny bit better, but not enough difference to trouble yourself with (IE it's VERY unlikely you'd find yourself in a situation where the Zenith would get a watchable picture at the same time the Sansonic wouldn't).
I did notice that the "signal quality" (not "signal strength") readout seems to be an average over time that does not reset itself when you change channels. Therefore if you're coming from a strong signal to a weak one, it isn't of much use unless you cycle power.