As users, we can't wait to get our hands on the actual product. We can't wait to see the UI and start playing with it. While these nicely designed bits of information just annoy us and prevent from getting there.
Imagine yourself going to a new gym. You're standing there awkwardly in your street clothes, and a polite sales rep is showing you around. Are you listening to her carefully, or would you rather change into your brand-new fitness attire and try out that shiny elliptical?