How I Use It
This shared whiteboard app allows the teacher to walk around the room and check on students' independent work. It also allows for some, (three for the free version) students to interact with whiteboard at a time. I would suggest using this for group presentations. It would be fun to see how the students present in a group and interact with each other while doing so. As a whole group tool, it does let the teacher use proximity to keep all students on task. Teachers can manipulate the whiteboard from everywhere in the room. So if working with an individual or small group, the teacher can change the board to allow other students to move on with the lesson.
Having used other apps, this one does not stand out as having any qualities that make it better than the rest. It does what it says it can do. The kids might enjoy the interaction, but they would no matter what app or device you use.