Nice little tool. I opened an external drive full of photos, some in folders. I could easily toggle individual photos or folders to disappear and re-appear. I already wrote to the developers suggesting that a key combo would be convenient to have to toggle visibility on and off, even if the app had to be opened (after opening in demo mode a short customer satisfaction window opens, giving the opportunity to rate and to comment). Help is built in, and more than adequate, including warnings not to fool with system files unless you are sure what you are doing. Bottom line: this does just what it says it will do, and for two bucks, it is a charmer.