The interface is really familiar to students (very similar to the Snapchat or Instagram story cameras), so the barrier to entry is pretty low and, in my experience, students have felt freer to be creative and fun in their video responses - as opposed to written discussion boards, where many students feel pressure to write 'academically' or formally (even if the discussion isn't that formal, written communication in the classroom comes with pressures and anxiety for some students).
The features (adding gifs to prompts, callouts, emoji, etc. etc.) make it easy as an instructor to express my own voice and bring more of myself into the online classroom, which can be a difficulty.
The mobile app allows for a lot of creative, unexpected engagements that would otherwise be tough in an online classroom - I had students video themselves on a walk and narrate what they noticed, for instance (need to be flexible if students don't have smartphones, of course).
LMS integration (in Canvas specifically - I think other integrations are less straightforward) is smooth and helps keep students where they need to be - in the online "classroom" and not running around on the web. Review collected by and hosted on G2.com.