I like the ease of use and the ability to do batch renaming. I dislike that it doesn't have an option for "Do not change" files or directories. This would be nice if you don't want your files/folders renamed for some reason. I also dislike how hard it is to find the file/folder you're looking for when doing a rename with multiple folders. You have to search through each folder one by one. Sometimes this can take up a lot of time. Batch renaming seems to work better than single file renaming. I'm trying to make a game in Unity3D and it was very difficult to figure out what was causing problems in my project. Using the Ant Renamer solves those issues.