I use IPS for 3 years, and after reviewing xenforo I was delighted.
Personally, I do not recommend IPS, I can comment on several defects but I will only mention one, they spend very little time on optimization.
This kind of review in my opinion are a no sense.
Users can like a certain software, and Admins can hate it. Or the contrary.
If the frontend is "good" maybe the backend is not. Or the contrary.
So, when admins and users can review something, results are so different that review is a no sense.
Just my thought.