The UI comes in handy, especially in mobile situations (car driving, cycling, walking, ...).
The app allows you to organize your favorite contacts in up-to 5 pages with a grid of buttons, configured from your smartphone's address book for quick dialing and messaging.
Alternatively, contact buttons can be created as widgets on your home screens. They offer a more efficient user experience than the default android's contact widgets.
(The 'SpContact Full License Key' app is required for full configurability and placing unlimited number of contact widgets on the home screens).