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 250+ 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.
Yes, I am using their Post Comments. Couldn't get them to work, but got a file sent to me and now they work like a champ. I have several of your add ons installed too. If you wanna' let me know which one you wanna' check, be happy to do so.