I love that it allows me to share my files with others in our office without having them store all their data locally or paying for expensive cloud storage options! It's easy enough to set up but not too technical so people who are new can get started right away while more advanced users will be able learn as they go along (and if you're willing).
The app itself has gotten better over time since its initial release date - we've been using this product now going back about 4 years and have had no issues at any point during those four plus years of us still actively working together remotely daily through various file shares from different devices/locations around campus via nas4free. We use SharePoint Online which makes setting up shared folders very simple with just one click once installed onto each device where ever needed throughout the school district. Files uploaded by students into these same shared folder locations then automatically appear within student grade level account dashboards when viewing documents inside Microsoft.