I must say, when I first installed this forum, I was amazed at how well it looked and the amount of controls you're able to customize with it.
But after toying with it and setting up the forum the way I wanted it, I ran into many problems.
The first MAJOR problem that I ran into was of their Permission layout. If you need to set certain forums only visible by certain user levels, then you'll be severely disappointed as the impression I got from it was excruciatingly irritating. First of all, setting individual permissions is based on front-end and back-end access, meaning you NEED to set both a front-end access level AND a back-end access level, even if you want to just make a forum accessible only by, say, managers.
I've spent at least 4 hours trying to figure out how to restrict access to certain groups, but failed miserably after trying every last option. I also noticed some major inconsistencies. For example, I set a forum to be accessible by Author on front-end and Manager on back-end. I logged in on my author user and the forum didn't show up. I tried changing the access on the user to Manager and it still didn't show up. I then decided to try changing the front-end user level to Registered. That made the forum show up for registered users, but that's not what I wanted it to do. When I changed the front-end access level on the forum back to Author, I was surprised the forum still showing up for my plain registered user, and every attempt I made at trying to hide it from registered users (aside from deleting the forum and remaking it) failed. I imagine that this is a bug within the programming as I haven't seen inconsistencies like that with any other component I've used.
Another issue I've run into was the ranking system. You cannot edit current ranks nor can you delete current ranks. The only way to get rid of an existing rank is by logging into MySQL and manually dropping it from the table.
My final complaint about this is their lack of dedicated support on their website. I have come across virtually no documentation on how to operate it. I also have tried asking questions on their forum and have not gotten responses back. I noticed, too, that other people have experienced poor support in relation to this component, and have heard of people's posts getting deleted on their forums, obvious bugs being dismissed as user-error, etc.
I've finally given up on making this forum work efficiently, and am trying other solutions.
On a final note, I can say that it's a very robust component with many features and I can tell that the developers of it put a lot of time and effort into making it. But as for maintaining it and supporting its users, I would have to think otherwise.