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Pros
Pro Auto-sync
Photos in the library can be automatically uploaded to Flikr, which enhances the usefulness of the free TB they give all users.
Pro Provides 1TB of free space
Any user can store 1000GB of photos or videos completely for free. Strangely, the cost for 2 TB is $499 per year.
Pro Provides photo meta-data
Users can see lots of info on each picture including: shutter speed, camera and lens model, category tags, license info, aperture, and location.
Cons
Con Low quality in-app camera
The in-app camera is lower quality than standard camera apps, so it's better to take a photo normally and then import it into Flikr.