I like that this is an open source software with many features which makes my life simple as i don't have t manage multiple products for different needs of privacy protection at one place! It's great because there are so much modules available in various price ranges making your product flexible enough according to you budget limits but not cheap either!! If anyone looking into something similar then definitely give bigprivacy try its easy setup just go through their documentation or ask them any question they will help out all round no complaints from our end about anything yet we were using other solutions before too.
We're solving our problem by providing secure access control without giving up user information hence protecting sensitive business files while allowing users full freedom over what can/cannot see etc.