Extremely useful for when you want to have more than one prefix for a thread. There are many usage scenarios for this and this functionality should have been a core feature of XF.
The frontend UI of selecting the prefixes is simple and works well.
What's great is that Xon is one of the few XF add-on developers who keeps adding features and is shockingly quick to look at and resolve issues (which I've only had once with this specific add-on, and the issue was fixed within 20 minutes of me reporting it).
You should buy this add-on even if you don't have the biggest need for it at the moment, just to support Xon's work.
6000 images that needed to be converted, and it hung up on the 3rd post. Absolutely will NOT go past it until I physically delete the image files in that post. I thought this was automated and it would skip the ones it could not edit. Guess I read this add on wrong. Uninstalling promptly since I have to edit every single thread manually anyway.
2 stars because it works 'sometimes'. If you post a photobucket image with the IMG tags, it just pulls the same image photobucket is showing about 3rd party hosting. Worth it for the price, but will be uninstalling it since it does not do what it says.