4. Pro: Mayday Button:
Users are a click away from customer service help at all times. The service is free, and Amazon CEO Jeff Bezos said during the launch event that after just 15 seconds of hitting the Mayday button, an Amazon customer service representative will appear via video chat. The rep can even take over a screen on a user's device for troubleshooting. The service works 24 hours a day.
If you're not a techie and/or you don't like waiting on hold, this is something you may wish your current phone has.