Quartet : intermediate japanese across the four language skills textbook

I have just finished Genki 2 and was about to start an Integrated Approach to Intermediate Japanese. However I saw a very positive review of Quartet on YouTube, and decided to order it. Is anyone else using this textbook? How are you finding it? There are very few reviews online and I was disappointed to see that the book doesn’t feature in the Skritter lists.

I’ve added this to a list of textbooks we’ll look into uploading in the future!