Here is what I have noticed so far with the HS-51 and the HD-A1. I originally tested the HD DVD player through VGA. DVI to VGA converter and 720p output from the player. Image was not even close to my Oppo and a SD DVD. Image was terrible!!! Hooked up via HDMI and set to 720p... "So no 1 to 1 pixel mapping... Big freaking deal..." Not much better
grrr. Next set it to 1080i... OMFG!!! Thought I was watching it through the Hubble space telescope! hahaha. Image was amazing. So it must be the scalers on the inside of the player. Wouldn't you want to output the most pixels and let your display decide what to do with them? Just a thought!
Some people complain about it not being a lot better than OTA HDTV... One word to ponder on, 1080i is 1080i no matter witch way you look at it. The higher bit rate just eliminates the pixelization that you get when a scene is moving. I will say that it does look smother than OTA HD though! Tested Serenity and WOW, looks good. Can't wait for Apollo 13 next week!
Another thing to consider is how well the studios scan in there film to HD... if they do a crappy job than it is not going to look good no matter what format it is on.
BTW, all the content is 1080p, it just doesn't output 1080p.
One question for the Forum, what are your settings for Contrast and brightness for the HS-51?
Audio DAC's are awesome, I have it hooked up analog.
SD DVD upscale is a lot better than the Oppo, surprise there...
All in all a really good player, except for the fact of no good 720p support.
Hope this helps everyone out there...