If you’ve ever toured re-sale homes with a realtor you’ll agree with me. When you first walk into a house you know right away whether you’re going to put in an offer based solely on your first impression. Your decision is made pretty much instantaneously.
A web site is very much the same. When a visitor lands on your site for the first time they will take in a lot of information (whether contained in your text or not). They’ll see your logo, the background colours, the fonts on the page, the photographs displayed and how they are displayed—within an instant.