Find File searches your whole computer for an item whose name contains (whatever you enter as the search query).
That's it. No other choices or search parameters available. No preferences to set, no view settings to adjust. You can filter the results of your search (by name), but that's all. If that's the kind of search you want to do, Find File does a good job, and it includes hidden files in the search results.
This is commentary only; I'm not going to rate this app, because I probably won't use it much. I don't often need to search my entire computer, which has three boot volumes and one data volume--all for different purposes. I usually know which one of those volumes I want to search, and I don't need to search the others. So, for most purposes, I prefer a search app that lets me specify the directory I want to search.
Nevertheless, I can't find any fault with Find File. It's free, it's FAST, it does exactly what it claims to do, and it does it well. If you need a free search application that provides more features, try Find Any File or EasyFind.