Andrew Reid has used this tool with his CP Biology students, and the students enjoyed the ease of use and creative effects.  It's easy to make banners at the bottom of the screen (showing names or other important information), add transitions between scenes, thought or speech bubbles, and lots more.  Plus, WeVideo is collaborative, so each student can sign on with their Google account, then all contribute to and edit a group file.  Here are some samples from the videos created by Andrew's classes: