If you like telling the story by filling the screen with foreground, subject, and background, you'll love this lens. If you do basic point and shoot, you'll hate this lens for the same reason: there is so much screen to fill.
This lens at 10mm gives about a 110 degree viewing angle, with no fish-eye effects. It does not offer the vibration reduction feature of the more telephoto lenses in the DX series, and doesn't really need it since it is so wide. Get the nice HOYA UV-0 filter, no vignetting.
This lens has allowed me to get previously impossible images: the whole bay and all the boats while standing at the dock, all 40 floors of the new building while standing on the sidewalk right beside it, the entire spreading maple tree with a nice up-close leaf in the foreground, wildflower close-ups with the mountain peaks in the background also in focus, images from inside buildings of the entire room that you are in, the waves on the beach with the beach sand grains visible in the foreground, a lot of the sky for night-time star fields or daytime cloud patterns, in-crowd people and action shots, and the list just goes on.
Like any super-wide, it compresses the subject, so beware of people placement, they will look a bit squat otherwise.
This lens seems to take a high percentage of my "Wow" shots.