Good point. I have a nice big screen and always use the browser at home as I often have other windows open. I use my phone in class as I don't have access to the internet otherwise and although I installed the app, just head for a browser window out of habit. I told my students about the app and some are using it but I have spent very little time on it myself.
Job for the weekend - use the app myself and next semester, move the students to it. I just have to check if all students can find the app as the Google store is not available from this location.