This is only useful for people who know what a search engine is. (Seriously, many people equate "googling" = "search engine", and don't know there is a general category of this thing). Unless there are two big bold buttons on start-up--one that says "Use Google for Search" and the other that says "Use Duck Duck Go for Search"--it would appear broken to them. Even then, almost everyone would pick "Google" just for name brand recognition.