Barn doors come with both functional and aesthetic benefits. Functionally, they are big space savers. The traditional swinging door typically needs 9 feet or more of space to function properly. While this may not be an issue for large houses, more space starved homes will find it more than a little problematic. They need all the space they can get for furniture, appliances and movement. Nine feet is a lot of space to leave to the door. French doors, as beautiful as they are, are even bigger space gobblers.
In a small space where every single inch counts, barn doors come in handy. A well installed barn door offers great space economy for whatever room you use it in. Of course, you need to have enough adjacent wall space for the barn door to slide over when it is opened. But this is often preferable to similarly space-saving pocket doors that require much more work to install or remove.
A small disadvantage with barn doors is that they may not close as quietly as traditional doors. But a good contractor should be able to install it in such a way that noise is reduced to a minimum.