The disadvantages of a mind map

Are there disadvantages? 

Yes, as a matter of fact there are some, although they contain some advantages in them as well.
 
you cannot copy a piece of text out of a mind map; it just doesn't exist. It's all about branches containing keywords. But whatever info you're using out of a mind map, due to the fact that these keywords were formulated by you or by consensus with your team, when you use these words they will sound like it's your work or ideas. This is because you can visualize and formulate the words in such a way that they really sound like they are yours.

Sometimes it happens you want to redraw a mind map. This means you'll have to start all over again. But what is the problem with that; it will be a good rehearsal and it will improve your memory on this topic. 

By definition a handmade mind map is unique. This means that lots of people will have trouble interpreting your mind map. But if you copy this mind map and pass this mind map to this person and you give him/her an explanation it will actually increase the level of understanding of the listener. Mind maps are great for preparing an essay, summary, text or presentations. But I wouldn't use it as a final document which you hand to you exam master; that wouldn't work at all! 

Let's go to the comparison text vs mind map page.