By customization on dont mean pure aesthetics, I mean the ability to use the tool as a way to create app store submission packages that really work. The dashboard is still buggy, doesn't behave well in Chrome and most of the time just reloads the homepage when you try and filter by platform.
I guess if you want your mocks you have to go take professional picture. This is a well organised, functional app please. You even get more mocks here out of the box.