I thought this was a great workbook. I feel much more comfortable with my Kana, (Hiragana and Katakana), and I recommend it for beginners that learn best through repetition.
If anything, I wish they would have added pronunciation notes for the sounds, as I quickly discovered I was interpreting them incorrectly. (For instance, “I” making a long “E” sound.) Also would’ve liked a little note about the small “tsu” being silent and leading to a double consonant. Stuff like that.
Overall, I’m glad I did it, it gave me a better foundation for stroke order and memorization. I also really enjoy their IG content and recommend it for all beginners.