I have tried this in the past. I dont know if it's the same product or other, but same idea. My main problems where that I want to pause, maybe google some words or terms or person, go back to previous sentence, or skip some sentences alltogether. It gave me a lot of trouble because I couldn't find the text I wanted to highlight/rightclick/google etc, so I ended up taking more time for the same text.

That being said, I do believe it has it's uses. Maybe on a mobile device, maybe for literature only.