There just aren't enough updates to warrant paying $35 every three months, and the other licenses are way too expensive. It's a good addon, but the author really needs to rethink this pricing scheme, it's outrageous, and therefore, I can't recommend anyone purchase it.
The add-on is great itself but had issues when I installed a new theme by themehouse. The advanced forum stats css became broken due to conflicting css properties created by the theme. After reaching out to support, I was met with slow replies, which led to me figuring out the issue myself. I asked for help to code it to have it work with the theme., but was met with “thatll cost $90 for custom development” when in my point of view I paid a lot for this add on and should get the help to repair it. Wasn’t asking for help coding just asking for a direction.
This addon is very good, and would be five stars except that the licensing is really expensive. The $35 price tag is only for 3 months, and according to the website, that's 40% off! Otherwise, the support is really great, the author is quick to make updates and really takes into account customer input. I would definitely recommend this addon for anyone that missed having this feature from xf1.