Lyn is more than just an image viewer for your Mac. Besides letting you browse your photo collections, this program also enables you to convert your pictures between various formats, view photos in slideshow mode, share your favorite photographs directly from its interface, and so much more.
Unlike Mac's Preview tool, Lyn lets you choose between various output formats when exporting images. Furthermore, it can batch rename multiple pictures and alter metadata in one go.
Another important advantage is the fact that the program gives you access to many view modes. For instance, you can preview the images from a local directory in slideshow mode. You can even add background music to the slideshow by going to the Preferences panel and selecting the preferred song or iTunes playlist.
The only aspect you need to consider before buying this tool for your Mac is the fact that you can find cheaper solutions. However, they aren't as feature-rich as Lyn.
In conclusion, you should purchase Lyn for your computer if you're looking for an effective, easy-to-handle, and feature-rich alternative to using Mac's Preview to handle your photos.