Facebook allows my small business to have a free online presence, which means I am able to reach a bigger audience and gain more clients. The Page Manager app allows me to control my page on the go - I can respond to messages, schedule posts, and view activity on my page - all from my iPhone. It is completely free to setup and maintain your page with Pages Manager.
What I dislike most about Facebook Pages Manager app is lack of support. It is a powerful tool that can be complex and there is no 1-800 number you can call for help. If you need support, you'll need to sift through forums to find answers to questions. The app can be buggy at times. It is definitely not as powerful as the desktop version - you'll need to hop on to a computer to complete certain tasks.
If you have a business and you have you a Facebook Page for that business, you'll need Pages Manager to control your page when you're away from your computer. Facebook likes to see pages respond to messages quickly, and I can only accomplish tasks like this quickly with the app on my phone. It is not as powerful as the desktop version, but that is true of a lot of apps that have desktop counterparts.
I am a photographer who always works on location, so I don't have a studio, thus my business has no physical presence. This means that I rely heavily on marketing myself through online platforms. Facebook Pages Manager has allowed me to reach potential customers that I may have never found otherwise, all through the ease and convenience of my phone.