I never felt a need for such an utility. Your apps will tell you when there's an update available, why spend money on a product that doesn't really help you?
AppFresh vs MacUpdate
One is free first of all, and they help consolidate updates into one place for convenience not unlike ios. Besides, without these tools, the apps have to be running for them to tell you that they need a refresh; Mac store apps pop up in the native updater and others elsewhere, it is annoying. I agree that it is not a necessity, just a convenience.