my gf is watching Gilmore Girls on WB in HD as I write this. I'm using the HR10-250 HD Tivo via HDMI.
1. There is NO lag what-so-ever.
2. The lip/sound is in sync.
3. I'm going to hookup my pc which has this video card:
GeForce 6800 GT AGP Video Card Nvidia 256MB
4. No visible rainbowing, but not like i saw that on the samsung either.
My initial impressions is: EXTREMELY GOOD.
The setup using the HP Stand was very easy thanks to the hole they put on the stand. The front connections do NOT require extra long cables, and this new front connection is absolutely wonderful. The light bulb is very easy to take out. 2 screws up front, 3 screws in the middle, and it pulls right out.
Compared to my Samsung HLP 50", the picture is more vibrant, but i don't think it's a good comparison since the HD-Tivo is now in 1080 vs 720.
The TV does require about 10 seconds to warm up vs. the much faster Samsung.
When you switch sources, it displays the picture in thumbnails. The thumbnails are NOT live pictures, but rather 5 second refreshes of each one.
Upon playing NBA Streets in 720P, the picture was huge. Again no lag.
I'll test w/ my PC tomorrow.