Pretty terrible. Yes, I can sign up for classes, but that's it. As far as I can tell, the scan in feature isn't available in the app, so you have to go to your browser to get it - what on earth? And calendar subscription is a joke. I've tried subscribing on my desktop Outlook, Outlook on the web, and Google Calendar. The only time it updates is if I unsubscribe and resubscribe. (Note, this is not an "update.") This is not something that should be hard.
App and website won't send confirmation email, despite following troubleshooting steps, thus making it impossible to sign in.