Pros: First of all, the free version of Udutu was excellent. Then I started paying because I wanted the ability to customize the interface. Udutu may not have had all the features of an install/application authoring tool, it had just what I needed to create eLearning tutorials with images, text, video, audio, and quizzes. Plus, because it was cloud....it was so easy to collaborate with others in my organization. That might have saved me dozens of hours during a development project not having to publish and share drafts. I could just share a preview link on the web to get feedback.
Cons: It does not have the ability to create simulations or to record audio/video in the tool.
Overall: I recommend Udutu if you want a quick way to get eLearning to your audience, know what you want, and that means you don't want the fanciest features. If you do any kind of training that changes a lot, this is an excellent tool because it is nimble and allows changes to be made quickly.