I haven't tried the app (no iPhone). Can someone explain to me why the Mailbox app is so great? From the intro video, I see a typical email app with a couple of

I haven't tried the app (no iPhone). Can someone explain to me why the Mailbox app is so great? From the intro video, I see a typical email app with a couple of extra gestures thrown in. Like Sparrow, it seems it's more marketing and hype than a radical upgrade to the email experience.