How I Use It
I use Apple Classroom as a teacher training tool so that teachers can then use it in their classroom. The setup is quite easy. The teacher downloads the app and creates a class. Students open settings on their iPad and will see the Apple Classroom icon pop up. They click on it, find the teacher's class, and they're in. Now the teacher can see what apps the students are using (either as an icon or a thumbnail of the students iPad). Teachers can also lock students into an app to alleviate the question of "Are you on the app you are supposed to be?" Apple Classroom is also useful direct students to a certain website and not have to worry about the students finding the link or mistyping the URL. The only negative part of that feature is the fact that you can't lock students into a website. However, you can keep an eye on their iPad screen through the thumbnails. When closing out the class on Apple Classroom, teachers can see what students went to which apps and how long they were there.
For a free classroom management app, Apple Classroom is very useful. I like having the ability of forming groups so that I can lock a group of students into one app, while at centers for example. I also like the feature that alerts me when a student "leaves" my class (to sneak into other apps perhaps?).