The great thing about XMind is related to the large number of customization options that can be used: I made particular use of this software during the years of university study. It's easy to take notes on the fly by creating a diagram of what is said in classroom during lessons. Each element of tree diagrams can be decorated with notes. There are so many different styles to make it more readable diagrams. The software is crossplatform and is also supported by third-party applications (such as iOS mobile application). The most interesting aspect is definitely export options: for a machine learning course I realized lot of schemas in different sheet and then I printed them as PDF, with the advantage that the contents are automatically sorted in the order of creation (without losing consistency). You could also choose to export with index of contents and in Word format, to change the style (font, dimension, etc). Before this, I used a lot MindNode, but this is definitely better.

I really liked XMind to the point that I upgraded to XMind 7 Pro. XMind is easy to pickup, you will need to learn a few keyboard shortcuts and you'll be on your way within 30 minutes (worst case). The latest version (7) was a great upgrade, I use it on OSX and there's nothing that competes with it. It handles large mind-maps with ease, doesn't lag, and the map navigation is quite simple and intuitive.

Very easy to use and to learn, XMind is a must for me and my team. I use it to organize my thoughts when developing software, and my entire team use it to build use cases. The interface is very clear and simple, enabling everyone's contribuition quickly.