iCloud

Is convenient because it allows for you to sync pictures, music, and applications to all your Apple products, without the use of individually downloading them to the different devices. It saves you time. You simply sign into your Apple ID and iCloud does the work for you. I think this was a very genius idea and it's taking technology up a step further. I see no problems using this service because you manually input your Apple ID so there's no way to sync it to a device you don't want to.