There's not much I dislike about this software - it works well! It has all of my documents stored securely online within one place (no multiple boxes full of paperwork).
The interface could be improved by making some things easier for someone who isn't very tech-savvy like me though! Easy access from anywhere at any time so that we can work together when needed without being physically present near our desks/offices. This makes collaboration across many different locations possible which increases efficiency & saves money too! We're using PFS as an internal document sharing tool but also used sometimes externally where people have their own passwords etc., rather than having us login into separate services individually each day.