The best thing about using this is that you can have different version of your documentation in one place without having to manually create each page or edit them individually - everything gets created automatically for you! I dislike how difficult it would be to find something if you want to use another plugin/theme other than what's built into KWiki.
There are some things which could be made easier when inserting media files with images etc but otherwise great piece of software! You should give it try as there seems to be no downside in trying it out first before deciding whether or not its right for you. We've been able to keep our documentation up-to-date throughout our website very easily, and we never lose any information from our previous versions anymore!