Using FlipGrid in Schools?

Flipgrid is a video discussion tool/community for classroom that asks your student to share their video responses. You add the topic of discussion and your students respond with short videos. They can respond to your topic/question and/or discus between them self. You also have the possibility to evaluate their responses and give them feedback in the app. I was using the app last school year in High school and the kid's responses were in majority very positive. Link: Is anyone using this app?