Reviewers describe Practical UI as a clear, practical reference for applying UI and UX principles, not just learning theory. They repeatedly praise its straightforward rules, strong visual examples, and bite-sized structure, saying it helps both beginners and experienced designers, as well as developers and non-designers, make and explain better design decisions. Accessibility stands out as a major strength, and some use it for mentoring, team design-system work, and as a baseline guide. Criticism is limited, but a few wish for regional pricing options or a print edition.