This is a good point they make. However, it can backfire if you are doing client work. Not all people get that these are unfinished prototypes. This is why des

This is a good point they make. However, it can backfire if you are doing client work. Not all people get that these are unfinished prototypes. This is why designing with something like say balsamiq is so useful. Clients and co-workers will talk about how something works, not choice of color/font/placement. Once you know how something should work, then you can argue over style. Good design is more about how something works than how it looks. The iPod scroll wheel was about improving the way you interact with the device. The overall design can very easily fall into place once you have the interaction nailed.