I recenty picked it up while searching for the ultimate photo editing app.
It has tons of editing features packaged in a well designed interface optimized for retina display.
For only .99 cents its a steal.
My favorite features are
-you can blur any part of a photo, also control intensity of blur.
-ability to change the color of any part of the photo for example you can change a persons shirt from red to blue
it also has all the basics like saturation, hue, contrast, noise, white balance, sharpen/unsharpen, cropping, etc..
This app literally does the work of multiple photo apps.