The Best Astronomy App?

[ReformatPlanet]

I'm really curious about the astronomy apps, but they're all pretty expensive to be taking chances on, and often the itunes reviews are all over the place. It's hard to tell if any of them really act in the way i would hope, and thats to show you a map of the section of the sky you hold the iphone up to, and continue to track as you move it around. Has anyone had experience with any of these yet?

UPDATE-

I ended up getting GoSky Watch. It's quite excellent. Really classy presentation and smooth animation. I notice Starmap is being featured in the App store, but i didn't like it's presentation as much as GoSky.