An extremely expensive book filled with almost nothing. Much redundant obvious information not linked with UI but with eg. pop-psychology of color. The most important trends explained without a deeper analysis of their pros & cons. Lack of link with development or more complex visual scenarios. It's really important for me that I know about optical weight, but how we can sell it to devs. Personally, I feel like getting my money back. Since it is an electronic file it is impossible. I believe there will be some updates on these materials that show more extreme cases of UI design with more levels of hierarchy & difficult decision examples.
A well coordinated account of design systems for front-end developers and define the differences in UX with UI, Customer Experiences and Product Designer.