1. It does have two digital tuners. I can be recording a scheduled program off the air while I am simultaneously using the second tuner to watch a different program.
2. The unit records and plays back in whatever the transmitted OTA signal resolution was. Including 480, 720, and 1080i HDTV. The playback quality from the HDD hard drive to my Sony HDTV is indistinguishable from the Sony TV tuner, I.e. crisp and clear.
3. The hard drive is 320 GB. And when you are recording HDTV you CAN fill it up and have to delete stuff.
4. When you want to have a program recorded BY NAME it is easy. Just use the button to the upper right of the navigation bars around the OK button. Select the program you want and hit OK. Then, before the scheduled recording time hit the schedule button (left side of the remote, second from the bottom) and scroll down to the program you want repeated. Then go across to the date column and scroll up/down to get what you want, I.e. every day, or M-F or every Saturday or whatever and hit OK. The program TITLE is retained. By the way if you are missing the beginning or end of a repeated program go in via the schedule button and go across til you get to the start time and back it up a minute AND toggle across to the duration column (e.g. 30 minutes) and increment it up as desired. The recorded program TITLE is not affected by this editing of the schedule. Unfortunately if the TV network switches time slots you will be recording a different program with your old Program title, which forces you to delete that schedule item and re-enter it. I don't know why networks do this switcheroo with favorite programs.