The ability to add custom variables for each Crash report, which makes it easier than ever before when you need multiple reports per user session or even device specific data in your app logs! I do not like how easy this was used by hackers as soon there were any vulnerabilities found with its code base (a lot of them!). It's free so we didn't really have much reason - maybe that will change now? There are other tools out their such as Sentry/Airbrake etc but they tend more towards server-side logging rather then being able use locally to get all kinds of useful information about crashes from devices running our apps.