Rolling your own GUI should be done when the native OS GUI doesn't meet the expectation or needs of your application. A custom GUI may not play nicely with accessibility and may look increasingly alien with OS updates.

I don't see any advantage to using the iOS look, and it only added to my confusion when downloading. I wasn't sure if it was at first looking at the screen shot an app that required an iOS component.

1) No maximize dot, I wasn't sure if the window was resizable until I moved my mouse to the corner

2) No Resize in icon in upper right hand corner

3) Lack of menus (really, ever action must be found in the gui?)

4) clicking off the app window does not "grey" out the title bar letting me know its not the front window.

5) Close/minimize icons do not highlight on click

6) Settings fields cannot be tabbed between

7) Settings cannot use keyboard controls for the cancel / save like OS native dialogs

These are just the errors I noticed while writing this post. The app looks like it could be a nice MAMP alternative.