I usually hate to speak in superlatives, but in this case … It's very well thought out, it's universally applicable, it's very easy to use, it's stable, and it's (almost) free. What do you want more?

If somebody, after having tried iFlash, would comment "I don't need such a thing", in my opinion only two conclusions would be possible: a. this person knows he's going to die very soon; b. this person may physically survive for another seventy years, but mentally he's already dead and buried.