This is an extremely straightforward book to rapidly assimilate a solid beginner's Korean vocabulary in the style of an early toddler performing fast-mapping. I enjoyed the match to my level (wherein each set of themed vocabulary, such as opposites, household, transportation, nature and the like) contained equal parts of words I'd already confidently acquired, words I'd heard a few times yet forget easily, and brand new words I'd not yet encountered. I really enjoyed the various practice activities and exercises whose repetition really helped. The goal here is memorization and recognition. It doesn't get too deep, and that's what I wanted and needed.
I also appreciated the final review unit, which included words from all the chapters. Language is more readily acquired when it is recalled with both short- and long-term memory, so the final unit was helpful and wise to include. There's also a set of flashcards at the back of the book, so the reader can continue practicing after finishing the book (without having to hold onto it).
I would rate it higher; however, the romanizations were rather an insane mismatch to the actual sounds of the words. NOBODY writes Korean words (neither Koreans nor foreigners) in the roman alphabet in the way they're presented here. No conventional romanization spellings are followed. Including the bad romanizations seemed pointless and a distraction from what should have been a simple one-to-one exercise in learning the hangeul. Besides Korean has extremely shallow orthography -- the hangeul itself is a perfect guide to the pronunciation as long as it's well understood by the reader.