It is our primary SFTP server product. It includes several add-on module functionality, including ARM (reporting), HTTPS, SSH, high security, and they have great support. They are good leaders in managed file transfer and logging. It is also easy to setup and maintain.
It costs a lot for their enterprise and add-ons, as well as yearly maintenance.
Consider the value and ROI of using this product in terms of time to setup and maintain and what it can do. It is expensive, but it is easy to setup and maintain. I can setup a new account in less than 5 minutes and provide the new login credentials to the person. It has lots of useful modules, though it can get pricey and yearly maintenance can get expensive.
SSH and SFTP, as well as HTTPS functionality, and reporting (ARM). It has been reliable over the years, easy to setup and maintain, update, and good ROI.