Sure, the iPhone also has a built-in voice recorder but it's awfully counterintuitive and slow. I wanted something really fast which would resemble an old analogue voice recorder. Say&Go is best for that. It starts recording immediately when you open it. I find it especially useful in my car or when I'm in a rush - just open, say, and close the app. The note is saved. In a car, just open (e.g. using Siri) and say. It's going to stop recording automatically when the time-limit is done.
And you can change the name of a recording within the app and when uploading to Dropbox