I purchased this add-on even when it was first introduced over 2 years ago (06/2020) to support development. The idea of the add-on is good. However, the developer doesn't maintaining the add-on that well. His customer service is not even compare to some free add-ons. Ignoring customer's complain is not the way to go!
Unusable as there are so many bugs, as it is, this add-on may cause you to lose SEO points rather than gain them.
No update made it possible to reach a usable version, on the contrary each of them added functionalities and compatibilities with other add-ons which themselves added new bugs.
The lack of communication from the developer for several weeks does not bode well for the future of this add-on.
It gets all stars from me. If there were more, I would click them too. There are certainly many nights and days of work behind it. For me, the use has been worth it. My forum is now in the Google rank on Wikipedia. For me it is worth any money in the world. I have already translated it into German. Was mega much stuff.