This is a great example of simple design winning out. Great design, great illustration and really straightforward copy make this one of the better product websites out there.
Chunking: How to Design for a Brain That Can Only Hold Four Things
Your working memory holds about four things, not seven. Chunking groups loose information into meaningful units that slip past that limit, the psychology behind phone numbers, scannable pages, multi-step forms, and grouped navigation.
I like the colors of the user guidance. However, I think there is a lack of synergy. as indicated by the download button, which should be the same color in the navigation. Blue download, blue link.