As a former designer, and still a webdev, this book isn‘t really about UI design, but more about component design & layout. It’s not gonna help you design coherent interfaces.
The information on White Space, font weights & -sizes is good & practical. The color section is underwhelming. For non-designers there are some great pointers like how & why to break out of 12 column grids.
All-in-all a bit unbalanced, but it works ok as a basic inspirational tool of you wa,t your app or site to look like most otter apps or sites.
So, it’s not too bad, but hefty overpriced.
If you don’t have a design background, this will help you design better apps. If you do have a design background, this is a < 1 hour read: ok to brush up your knowledge , a few good pointers here and there, but I already mentioned it: way too expensive.
3.5 stars
YMMV