Remind does an amazing job in sending reminders for my sessions for biology automatically. These help me market my sessions well.
The remind app works well with both android and iOS and my students have never had complains about notification problems with it either.
As an administrator, it is also easy for me to keep track of the messages I sent, create to-do lists and just be organized in general.
It also allows you to create separate class sections which is great!
There is not much that I dislike about Remind 101 because of its high functionalities. However, the one thing that I absolutely hate about it is that the messages are only one way, so if some of my students have questions or queries, they have to send out mass emails or spam my email to get their doubts clarified. This is not good when you conduct tutoring sessions because students come up with a lot of questions even after a session and Remind cannot help me on that.