This Mac application does exactly what its name suggests. This utility is designed to let you preview vCard files on your computer. By working with this simple program you can be sure that the data you import to your Address Book app is correct, also you avoid messing up your contacts list with inaccurate information.
You can import multiple vCard files and preview their details one by one. Moreover, the utility gives you access to an integrated search tool that helps you immediately find a vCard in case you import a large amount of files.
The application displays a thumbnail with the contact's picture, mobile phone number, email address, and any other type of information the vCard file contains. You can't alter the contents of the vCard files: you can only preview their contents.
Nothing more specific can be said about this program. It does exactly what's being said on its homepage.
In conclusion, I'd say it's worth installing this free application on your Mac only if you need to import the multiple contacts info into your Address Book program and wish to be sure you don't add incorrect details in the process.