1. In my case, component was the same PQ as HDMI.
2. It will be 16X9 when viewing live. It will record squished 4x3, which you will need to unstretch, to fit your 16x9, when playing back the DVD. Looks fine after the unstretch.
3. Use s-video to connect your DVR to the EZ-27's line in.
4. Note the PQ viewing HD through the DVDR will not be nearly as good as watching directly from your direct TV box. (just thought I'd warn you) It will be 480, even though it may be upconverted, it still starts out 480. Please don't expect HD. Recordings of HD can be best described as HD lite. It's about as good as 480 can be though.
I really like my EZ machine for recording HD OTA. It's the best PQ DVDR I've seen.