We just purchased (I guess leased ) the ridiculously priced HR21-600 (from Best Buy). It is the black one, the HD DVR. We are having it installed next Sat. I have a few questions: 1. Does it have as many problems as the HR20? 2. Are you able to record two shows at once, or record a show while watching one? 3. What does it mean that the receiver has no ATSC or OTA reciever, will it affect my HD? 4. With this particular box is an HDMI or Component cable better? I heard it all depends. 5. Does an HDMI cable come in the box? 6. How is Directv HD? We have the Choice Xtra package. Is that enough HD channels? Hope it has NFL Network HD. Thanks for the info!