Initial observations after one hour of use:
When recording from an analog Comcast STB to the HDD on the HQ setting, I CANNOT tell the difference between live and HDD so far.
Won't be trying the built-in digital tuner yet. No need to, thus far, since the STB gives me all the available channels in easy fashion and I'd have to switch cables or add another splitter. The last thing I need is another splitter in the lines. I'll try it eventually out of curiosity.
Chase play is great. But you already know that. I'm having trouble wrapping my brain around "no more commercials!"
Ability to record video from STB and simultaneous audio from Rx FM tuner (Eagles football simulcasts) through L1 is flawless. Audio quality is as good as the old hi-fi VCR.
When 515 aspect ratio is set to 16:9 as suggested, still records and plays back in 4:3, but it is of so much better quality than the old VCR I can stretch it with the TV's format modes with little loss of resolution. Using it for the time being with a top-of-the-line (two years ago) Panny LCD with very high quality 1080p upscaling, which helps.
Very intuitive HDD operation for basic recording and playback operations. An easy and perfect upgrade for anyone coming from a VCR (and the 20th century I guess
Sounds like an idea worth trying. I'll set up the skip/replay times similarly. Thanks.
Many thanks for all the help guys. I'll continue to play, read and post as additional comments are warranted.
OK, it does record 16:9 signals in 16:9, at the same reduced (non-screen-filling) size that the SD STB outputs. Still learning here.