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Full user review
"Powerful and user friendly for the most part"
Allows beautiful organization of albums and most of the fine tuning you would want on your photos.
Missing a few of the more sophisticated features of Photoshop CS5 although for most applications I find it more user-friendly.
I have Aperture 3, Photoshop CS5, and Nikon Capture and use the Aperture 3 most often by a large margin.