We have been using Raygun for several years and it has been brilliant. We have Raygun set up in all of our dev environments and it has been easy to setup and it's our "go-to" tool if an error occours. It has been the first thing we implement in all of our solutions for error tracking.

When using Raygun I love how easy it is to go from finding a bug to being able to see what exactly is causing the issue. Before Raygun, finding the cause of exceptions in our applications was proving a nightmare. Once we added Raygun to the mix, having the ability to look at the stack trace is brilliant. Generally the grouping has been pretty handy to know how often a given issue has occured as well as when.

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.