In the past you can only have one crash reporting tool in the App.
In the release notes for Xcode 6.3, I do see that "[Xcode 6.3 includes] a new feature to help opted-in App Store users and TestFlight users collect and analyze crash log data for your apps."
It would be nice to continue using Crashlytics for users that are not opted-in.
Question: Can I continue to use Crashlytics / other crash reporting tool in conjunction with Xcode 6.3 crash reporting tool flag turned on? Please share your experience.