I was torn between the Nikon 12-24 and this lens for my DX ultra wide DX needs. I chose this lens due greater angle or frame coverage and I am glad I did. That extra 10 degrees of coverage is actually a lot! I also was convinced that this lens is sharper than its 12-24 brother.
Widest angle you can get (at this time) for DX; sharp; high contrast image rendering
Other than minor complaint about distortion at 10 to 15mm, I do not have any; But such is the case with all ultra wide lenses, it's just that this one has bit more distortion than most lenses