I like the ability to see how many words are being replaced and how many characters are being replaced. I also like that I can choose whether to do a case-insensitive or case-sensitive search. Sometimes it doesn't always work. It happens when you have a lot of words with the same characters.
For example, if you are trying to replace a word that is very similar to another word, it doesn't always work. It is a great tool to use to make sure that all of your words are being replaced correctly…