In some cases they have more info than official websites. For example for Asus Zenbook UX305UA they have info about two models -AS51 and -FC001T. Asus official website does not have these details (<a href="http://www.asus.com/Notebooks/ASUS-ZenBook-UX305UA/specifications/" rel="nofollow">http://www.asus.com/Notebooks/ASUS-ZenBook-UX305UA/specifica...</a>)