Colloqual Ukrainian is not my first Ukrainian textbook and I was a bit skeptical at first for 4 reasons:
- The book is (seemingly) not written by native speakers
- The first chapters already start with some advanced grammar
- The order in which new subjects are introduced seems mixed up
- There seem to be some typos where й is written instead of и with an ` accent above to indicate the stress of the word
However, this absolutely does not mean that it is of low quality. I do see an obstacle here for people with 0 knowledge of the language, so I still recommend Yuri Shevchuk's "Beginner's Ukrainian" for the first steps, which also goes into more detail regarding the Ukrainian culture.
For me, Colloquial Ukrainian was a fantastic book to practise and deepen my knowledge. With its large amount of dialogues, texts, and exercises (including sample solutions!) of increasing difficulty, a comprehensive appendix with grammar and vocabulary, as well as free listening media online, this is a fantastic reference and I enjoyed working through it.
The "Colloquial" book series covers a very wide range of different languages and I might move to a different country soon, so I will diferently come back to them.