Plenty of features to get excited about. Following the trail within Crash Reporting really helps debugging. From a Product POV the Real User Monitoring gives us very useful stats on who our customers are and the kit they're on. The relatively recent addition of Alerting is also excellent to help proactively manage services.

I like how deployments work and how you can narrow down errors per deployment. Closing out errors is intuitive. API docs.

New error alerts are great and it means you don't get spammed by multiple occurrences of the same error. We have remote non-technical users and this tool allows us to quickly narrow down the problems that they report.