Private Threads

Private Threads 2.0.5 Patch level 1

No permission to buy ($25.00)
A very helpful add-on; works exactly as intended. Great for keeping some of the more sensitive content out of the view of the general public.
I had the XF1 version of this and my members LOVE it! Posting went through the roof due to this add-on.

Currently setting up my XF2 test site and ran into a few small issues. Snog was amazing and resolved the issues immediately. If you're looking for a great add-on and top notch support - then Snog is a the developer for you!
Works well on my newest project with the latest version of Xenforo 2.

No members yet, so haven't stress tested it, but nothing appears to show that it will misbehave regardless of thread/post/member count.