This product is extremely easy to use and very helpful as well! It now comes as part of the IPhone IOS. Instant light source whenever you need it. No fumbling for keys or finding the lock in the dark. The light is very bright, you don't need to unlock your phone to use the Flashlight. Just swipe and tap. It's great for shining into small spaces, too. It's a flashlight. I have used it on inspections when my flashlight batteries go kaput or I have left it somewhere and do not want to dig for it. Can not come up with any Cons with exception of it not working if your battery is dead, but that goes for any flashlight. A must have.