I first downloaded the Hipstamatic app years ago. I struggled with the initial limitations processing the images to flattened jpegs and ended up discontinuing with it. It seemed a shame because at the time I had downloaded most of the films and lenses. I had purchased all those in-app add-ons only to ditch it.
Then I found Oggl. Another Hipstamatic app which allowed the tweaking using the films and lenses without flattening. Result. But I longed for the simplicity of the old Hipstamatic app.
Recently the Hipstamatic app has been massively overhauled to a beautiful app, with 'raw' conversion options, switchable filter effects and better sharing abilities. What fun.