Tracking app crashes and getting analytics like Line # File name etc is one of the most important aspect we look into our products, so that maintenance becomes easier. Crashlytics just solved our problem with a par.
Its just so easy to integrate, and adding NSError to catch block (just one line of code can do the magic)
After getting integrated with fabric.io it has added a array of options to check for app health, and a range of analytics.
Most liked feature is its app, that brings all your insights on your mobile