Since Amazon gave every user a $15 credit for Unbox + TiVo, I thought I’d give it a shot. My final verdict is a solid not bad. The quality of the downloaded video is just sub-DVD quality. All of the videos I tested were in 4:3 native aspect ratio w/ black bars on top and bottom for a total 16:9 aspect ratio. I just used the “Aspect” button on my Series 3 to resize this fill my entire screen.
As I have a Series 3 TiVo w/ CableCARDs, I have no PPV available to me. The Amazon+Unbox appears to fill that niche okay. With a 5 Mbps connection from Charter, it takes just a little over to download the full movie.