Great addon and fantastic service/communication from Liam.
I contacted he for version XF2 of this addon, and he made it on the fly!
He was real quick in developing at a reasonable price. After-sales support from Liam was also great. I buy one year license because it's a beta but will go to lifetime after beta.
This resource it's a must have at any community if you need to permit some level of privacy by your members. Simply add user groups based on custom fields, promotions, reactions score or whatever you want and create the permission string.
Highly Recommended! Go for it, you won't be disappointed.