For website users, first-glance impression might be very important, especially when there are many similar-function websites for them to use. Usually when we know we have many available and similar resources, we become somewhat critical. As Kristina Halvorson mentioned in her book Content Strategy for the Web, if users are not satisfied at first, they simply go. For websites, it is like “love at the first sight”. People may endure the interfaces at first, even if they don’t like it so much; but if it is hard to use too, they, like said above, they go immediately for other sites.