The only alerts I have enabled are for when a website/application pool is stopped, and if the computer goes offline.
IIS shows, I can start and stop websites/app pools from my mobile device or online tool.
I tested the alerts by pulling ethernet on the machine, after about 15 minutes, I got both an email alert, and an alert to my mobile. I also enabled login/off alerts and tested, those also worked fine.
No subscription yet, only 2 days into my trial. I've only received 4 alerts total so I'm not over limit.
Computer is not in maintainance mode.