BetterUptime is a finished and polished product. You're getting a fully tested, sleek, and reliable monitoring system that is pretty much set it and forget it.
If your website has any issues - you get notifications in multiple ways. Most importantly, you can schedule who is on duty and the system sends a notification to only those on duty.

This is one of the best deals to come in on AppSumo - not one of those beta or quick cash grab deals - this is the real deal and grab it before it's gone.

What I love:
1 - User Interface
2 - Team Features
3 - Polished Product