It was super easy and fast to get started. The user interface is brilliantly simpler and intuitive.

MonSpark is a great monitoring tool. An impressive amount of checks are very helpful, and a nice free tier to get started with. It offers 1 min intervals on uptime checks and integration with SMS, email, Teams, etc. makes sure you can get your notifications. It offers 2 factor auth and the creation of teams if you have multiple people working on your uptime. I like that there are added features like SEO checks, DNS checks, traceroute, SSL expiration, etc. that really help in making sure my infra work is focused on immediate issues as well a proactive notifications (like when an SSL cert is going to expire vs after it already has). I'm really looking forward to a number of their roadmap items like URL checking.

It's easy to use and easy to understand.