Yes I found that out about it not outputting the "S" or Y/C video at the same time as HD thru component out, and that you had to shut it off (pain in butt) and change through menu every time. Am sure that is due to recording info needed by the unit. And that too was a downer for me as I like to be able to just change the input on my projector with the remote, to Y/C when I want to watch 4X3 footage on the "digital" or analogue channels, instead of the HD digital channels on component 1080I in.
I took the 8000HD unit back in yesterday, originally thinking I would try swapping it out for another to see if I got better PQ out of it, but while talking to the customer service gal behind the counter, I changed my mind due to that fact above, and to the 8000HD's really slow response on channel changing / menu issues. So I took home a non PVR newer 3250HD unit instead. It was actually considerably smaller width-wise than the older 3100HD unit.
Last night tried out the 3250HD and yes the image was much improved again both on HD through component and standard def footage from the Y/C out. Also, something the 3100 would not do, is that it gave me a 16x9 image with grey bars around it (downconverted to standard def. interlaced) if I was on Y/C input and chose one of the HD digital channels. Before the screen would just go black until I changed inputs on the projector. Nice feature if just checking what was on those channels real quick while watching non HD.
The only oddity is that my nicely calibrated projector, which often can run at zero detent settings for picture on DVD's and other source material, including the old 3100HD often, now requires for HD to have the nice punch and brightness you would expect, that I boost the brightness level and the contrast way up, with saturation also increased. Then it looks normal and outstanding again. Go figure.
Moral of this story is if you are swapping out non PVR HD Scientific Atlanta box for the 8000HD, you probably should have someone make certain you have the latest software, especially if running large images, and then make sure you like the picture as much as your old unit when you get it home and fire it up.