Best photo editing/creating app for ios?

I just read about an app called Filterstorm. It's $3.99 and boasts layering and a bunch of other advanced photo editing features. I'm contemplating purchasing this app since I'm also looking for a good photo editing app (not something elementary like Instagram). Here's its features list: Ability to apply adjustments to entire image, by brush, gradient, color range, vignette, or selecting opacity. Send images via Email, FTP,SFTP, Flickr, Dropbox, Twitter, and Facebook Layers (5 Max. When you go to add a sixth, the bottom 2 layers will automatically merge.) Export high-res images. Suggested max: 22MP (iPad2), 7.5BP(iPhone4), 5MP (iPad 1/iPhone3GS) Save edits as automations to apply to other images Masking Brushes with size, softness, and opacity controls Gradient masks Color Range masks Alpha masks Vignette masks Curves: Luminance, RGB, Red, Green, Blue, Cyan, Magenta, Yellow Levels tool: Luminance, RGB, Red, Green, Blue, Cyan, Magenta, Yellow Brightness Contrast Color balance White point picker Temperature Saturation Text tool Black and white fine-tuning Unlimited Edit History Cropping, with the ability to specify aspect ratio Scaling/Scale to Fit Rotation & Image Straightening Add Borders Combine multiple exposures Vignetting Sharpen Tone map (Simulated HDR) Blur Noise reduction Add noise Clone Tool EXIF support for JPEG and some RAWs IPTC support