What does the company do well? Started by a church for a church, this company quickly grew outside its own walls and began to serve other churches. They have been in the game for quite some time and now how to process and workflow your congregation through the desired steps. I would recommend Fellowship One but also strongly consider Planning Center.
What does the company not do well? Innovation isn't this company's strong suite. However, they have their processes down and work to ensure accuracy and reliability in their current platform.
What do you wish you had known about the company before using? As stated above, Fellowship One is one of the main players in the CRM or church management software companies. You can't go wrong with them, however, I would consider comparing them to Rock RMS or Planning Center.