What are the advantages and disadvantages of using StoryBoard?

Advantages:

•  It's  very nice to design interfaces
• You can use  StoryBoard Segues to identify navigation/modal       relationships in a cool manner.
• If your app supports multiple devices, it's a good way to               organize different views.
• Prototyping is another added advantage.
• Prototype UITableViewCell can save time and it reduce the            amount of the code too.
• you can see all the screens of the app at one place  by using StoryBoard.
• You can easily view  the relationship among them
• if you are working on someone's  code you can get the better        understanding of the flow of the app.
• You can setup the user interface for iPhone 4 and iPhone 5 by applying the retina form factor from storyboard, without running the app again and again.
• Clients can see the prototype of the app before start developing it, here storyboard helps you a lot.

Disadvantages:

•  It is only available in iOS 5
• StoryBoardSegues are kind of rigid and you may make use of       prepareForSegue many times.
• Like IB, not very friendly with other display engines and toolkits.
• Makes it hard to share designs for a single view or set of views - you have to send all or nothing.
• For storyboard you will need a big screen specially in case of iPad.
• Difficulty while copying views from other apps to storyboard.
• Problems in storyboard when multiple developers work on the same project by using git repository.
• Another disadvantage with Storyboarding not mentioned is that

       merges can be very difficult if not impossible if there are conflicts.