The only thing that this may be missing is multi-modal highlighting. As in, where the sentence is highlighted in one color and the word being read aloud is highlighted in a different color. This is a feature in Kurzweil 3000 and Voice Dream Reader.
This can be super helpful for people with print disabilities that involve vision.
But, I am definitely going to get this! I think this is the best accessibility tool I have seen on PC! :-)