It is very easy to use and setup.
The Word import works well (except for styling issues).
Users can collaborate and you can allow certain users to see certain content dynamically.
Many plugins are offered. The most useful one is to generate PDF on the fly. You also have send this page, print, etc.
If you do not require log ins (only allow anonymous users), I would highly recommend Confluence.
Room for Improvement:
I had a tough time importing Word and allowing use of an external style sheet (and not import hard coded).
Also, the pricing module needs to be adjusted. We want all our customers to be able to view Confluence as anonymous users. However, all our customers require a log in to our platform. And, to integrate with Confluence would require user licenses for every one of our users (over 10,000). It is not affordable.