Welcome to XF2 Addons. You can buy my Premium membership for $35 per year, and this gives you access to download any or ALL of the 335 add-ons that I have developed for Xenforo 2.x. In addition, Premium members will get technical support. Once the Premium membership has expired you can continue to use the installed addons on your forum as long as you like.
One of the most useful addons in version 1. Allowed us to logon as users to diagnose their problems getting onto and staying on the site.
We never used it to spy on users, but only to solve their connection issues.
It was very handy.