The usergroup system is one of the core features that XenForo has. It is very important that it has many customization features such as the one this addon provides. (i have been looking for an addon like this for 5 months now) In my opinion, they've just done it poorly. They could easily nail this system but they haven't. The base is there but the much needed features are neglected and missing. One of these features is the ability to have certain users manage an usergroup's users. For example, processing join requests (e.g. minor applications) or adding members themselves as they see fit. Going through the ACP for this should not be how it works. Luckily, another addon provides this need. Unfortunately, this also costs money. It really adds up to the costs, such important features that could be implemented very easily are missing. It doesn't just cost money, but it also costs time to find, install and familiarize yourself with the right addons.
Anyways, on to my review.
The price is incredible, and I am very happy to see this addon available for relatively cheap. However, when I went on to purchase the addon, I quickly found out that I had to register on another forum just to be able to buy it. I took a guess on why you would do this though. Probably in order to grow your userbase, have a place where they can permanently download the addons they own and also advertise your future content. But, this is a huge hassle for people that just want to purchase the addon. I highly suggest you make it available on XenForo itself, or at least have me skip registering. It gave a bad first impression to me. I now have to first find the addon, use my XenForo account to purchase it, register and use an account on your forum to actually purchase it, finally use a payment method and then I have to download, upload and install the addon before I can finally proceed with my work. You can easily see how the steps add up.
I've learnt my lesson and took a backup before I even uploaded the files to my forum. I was happy to see that everything installed appropriately. I did not get a HTTP error or anything crazy like I've had in the past where I had to reinstall my entire forum and start from scratch again. After installing it, I was happy to find out that it worked exactly as intended. The usergroups of the same category did no longer stack. I could finally disable showing just one usergroup instead of them all. (which is ridiculous to have as the only two options, there's such a major difference in that.) However, the styling did not work as intended. This is expected with custom styles, .less files and so forth. I went back to the forum I registered on and contacted the creator of the addon for assistance.
He replied within half an hour, even though his timezone has a six hour difference. I was very satisfied with the support he delivered. It took a bit longer to resolve the issue than I had hoped for, but after many attempts myself I entrusted him with ACP access and he resolved + improved it within 15 minutes. I felt that he had a lot of knowledge about the issue. He suggested me to clear my Cloudflare cache, improved the positioning of my code ( it was in the wrong .less file ) amongst other things.
Therefore I highly recommend anyone to purchase this addon. The personal assistance I received was incredible, especially for just five bucks. The only downside was the fact I had to register on another forum which really increased the time it took to actually get to setting up the addon.