Alfred for Mac learns your preferences as you use it and lets you create workflows in order to streamline navigation.
Pros
Improving accessibility: Alfred for Mac facilitates your access to the programs you use often. It does this automatically by keeping track of what you use and how you use it, which means that the more you use the program, the more efficient you will be.
Many options: This app includes lots of options to let you determine how it can best serve you. For instance, you can choose to have it run on startup, or you can select a hotkey to initiate the app. The Features tab also includes options for File Search, Web Search, Calculator, Dictionary, Contacts, Clipboard, iTunes, iPassword, and more, so you can quickly see what different areas of your usage can benefit from using this app.
Cons
Redundancy: You can already complete most of these tasks without this app, if you have a little computer knowledge.
Bottom Line
Alfred for Mac is a useful tool for almost effortlessly increasing your efficiency and productivity. While you can already do most things the program does on your own, you still have to do it -- and Alfred spares you from that task.