How reliable is Flighys for real-time flight data and delay alerts?

I'm curious if anyone here has actually used Flighys, an app that provides real-time flight tracking, live radar views, and notifications for things like delays and gate changes. It appears to pull from public aviation data sources, and I'm curious about how accurate or timely the updates are, especially when it comes to delays or last-minute changes. I'm also curious about how it compares to other flight tracking tools in terms of reliability and features. 

For reference, here is the app link: https://flighys.io. 

I look forward to hearing any experiences or feedback.