The most useful feature for me is to set the playback speed to be able to match up with my listening ability. It is frustrating on both sides - if someone is sp

The most useful feature for me is to set the playback speed to be able to match up with my listening ability. It is frustrating on both sides - if someone is speaking so slowly you fall asleep, or if someone is talking so fast you can't catch up. Being able to set video playback speed to 1.25x or 0.75x is very useful.