iSee is an image viewer that comes as an alternative to browsing your favorite photo collections with Mac's Preview utility. The application works with many image formats, comes with an integrated search tool, and allows you to move or copy multiple files to a new destination folder with just a few clicks.
You can import multiple directories containing pictures, choose between three image preview methods, and use the built-in search utility to easily find a photo within the loaded image collection. What's more, the program provides you with detailed information regarding any file you select.
Other than that, not much more can be said about iSee. Unlike Mac's Preview utility (default image viewer), this app offers you a limited amount of useful features.
iSee doesn't provide you with options to export pictures to other image formats, print photos directly from its interface or alter the imported files. Preview offers you the aforementioned features and more.
Another annoying aspect is that it occasionally crashes, especially when loading pictures.
Hence, I don't think it's worth installing this application on your computer. Mac's default image viewer offers you dozens of useful features and you don't have to pay to use it.