Not so sure about my Panasonic 50HD7U plasma and upconversion via HDMI connection. Ordered the card and installed it. Tried a feed from my new toshiba DVD 592 and everything was wildly magenta. So skewed that I didn't even attempt to calibrate. Thought it might be the player. So I did a feed from HDMI out of my cable box. No picture at all this time. Tried a new cable, same results.
Called supplier where I got the card and they felt it was unlikely the card failing and that there had been some "issues" with source devices and compatibility with HDMI input on Panny plasma display.
Okay. Returned player to Best Buy, got the only other HDMI compatibale DVD player they're carrying, another Toshiba, the 5970 (with assurances it could be returned.) Also called cable company and asked them about HDMI output and their experiences. All very new, they said, but should be working. He "reset" my tuner remotely and suggested I try again.
Hooked up 5970 via HDMI and got a reall picture this time. Connected cable tuner via HDMI and got a picture, although a bit quirky in when it decides to appear or not.
The killer is: now that I have both connections kinda working, the PQ improvement is marginal at best. (Yes, even after calibration).
My impression is an analog 480p signal upconverted by the display is still better than an analog signal upconverted by either of these DVD players and sent as a digital signal to the Panny plasma display. (Not to mention that the zoom and aspect functions of the Panny are far superior as well).
Will probably take the new Toshiba player back (since functionally and the build quality are marginal at best.) Will replace with a quality progressive DVD player and wait for HD DVD.