Star Walk 2 (US$2.99 with in-app purchases) is a solid update from the original award winning Star Walk astronomy program. This new version has a re-designed interface with the look and feel of each element beautifully crafted and drawing you into the inner workings of the app.
One of the horizon views contains a lake -- the water looks realistic and the reflection of the stars and planets sparkle, giving a tranquil feel.
Animation seems smoother in this version, and I particularly liked the 3D views of some objects. a a example, Messier 33 -- a galaxy relatively near to us -- can be rotated on screen and viewed from any angle. You can also do this with many comets, man-made satellites, and even constellations.
The augmented reality view remains as a holdover from the original app. Orient your iPhone or iPad toward the sky and the app activates your camera so you can see charted objects appear superimposed on live sky objects. It's a great way to explore the night skies.