Not a bad review. Like some of the other guys, I also missed the text to read, but then the information delivered in the video was okay. In terms of balance, I think that the balance between video and text in the G940 review was much closer to I would personally prefer - the main body is text, but interspersed with short (15-30 second) video clips to demo some of the points highlighted in the text. The only thing is that doing stuff in this way probably leads to content overlap, which means that you end up doing more work. *shrugs*
Having attended some conferences, I feel for you when it comes to... public speaking.

The only advice I can give on that respect is to be clear at all times, and exaggerate changes in tone; most of the subtleties you get in face-to-face chatter is lost in recording.