Is there any benefits of using Google Classroom for students?

I taught with Google Classroom for a while and I recommend Google's courses they offer for free as a teacher to learn Google Classroom.

What I like: student collaboration for projects and presentations/docs, date/timestamps, grading even on my Classroom app, ease of use (free for K12 public school educators), and everything gets saved to Google Drive. 

I prefer using Google Classroom to other options out there (I am an instructional designer first, then taught K12).

Each of Googles options for Docs, Slides, Sheets, Forms for assessment and how I could assign out different students to things with ease. Also, now they have a @ tagging name in the discussions with rocks. I would say age appropriate is 5th grade and up, younger kids there's other solutions that are better out there for the kiddos.

Source: I had a proven track record for having ALL my juniors and seniors in high school on Google Classroom. If I can do it, you can and again, it's completely free for public K12 schools. 

Good luck.