I used PDF Annotator in a lecture for the first time today. Mostly it worked fine. I had a bit of trouble with the circle tool due to lack of practice, and I also found it tricky to recognize the pen colours from their small icons without my reading glasses. But the main issue I have so far is that the hand tool pointer is rather small for on-screen pointing. When not recording it is probably better to point at the data projector screen (by some means), but of course this doesn’t work when recording lectures.
The PDF file produced is rather large: however it will probably be smaller once I “melt” the annotations permanently.
I asked some of the class after the lecture, and they couldn’t really distinguish Journal from Annotator (yet). But someone did suggest pointing physically at the big screen if I didn’t like using the software’s hand tool pointer.