Filters! is a new iPhone app from professional photographic and broadcast filter manufacturer/supplier Formatt Hitech.
The App: Despite being described as an app that "greatly enhances the photographic function of your iPhone by allowing the use of professional quality exposure adjustments, neutral density filters, graduated filters, color filters, black & white and special effects filters during the image capture", Filters! lacks the ability to import from the camera roll, making this "professional quality" app limited in usability.
What I think of Filters!: The filter effects are nice, and the app supports up to full-res support on an iPhone 5 (although you'll have to enable full-res in the apps options), so if you are looking for an app with a tone of live filter effects, then this app will not disappoint, but for me, and with its lack of import functionality, this app was a waste of £1.49/$1.99/€1.59, and has already been deleted from my iPhone.
App Store Link: Filters!; Price: £1.49/$1.99/€1.59