Just had this argument 20 minutes ago on using a native control versus designing our own and adding a few listeners - which has a better look and experience.
Background: taught a PSD to HTML college course; stopped doing PSD-HTML myself about two years ago; still favor PSD-iOS
Background: none.
Background: 20 years as a creative technologist currently doing iOS based experiential retailing for huge brands where the interactivity and visual appeal simply doesn't exist in stock iOS. And I also wrote an app publishing tool that works similarly to Adobe DPS (build informational apps in Photoshop, see http://www.youtube.com/watch?v=YXlHFhbqzHU).
For example, I've had discussions where a designer has insisted that the navigation bar is 50px high, which is a proper pain. (The correct solution here being to leave it at the default of 44px, safe in the knowledge that they'd have to be properly anal to count up the difference).