This tool is really great, super helpful in organizing one's thoughts when it comes to world-building. (Maybe too helpful lol.) That being said, I have had some difficulty in trying to use the program as a portable app (eg, on a usb drive or Dropbox, for example). It's a really minor issue, however--the problem is just that the images won't load if the program opens a universe file on another machine. Why I'm rating it 5 stars is that there is a warning regarding image loading if files are moved, etc. So lol, I'll chalk that up to user error. All in all, I love it and it's a blast to use.