It's a good beginners book if you're looking to learn more about living a healthy life, finding meaning, and being happy. There are some very good contexts about Japanese culture and their outlooks that I didn't know about.
The first half of the book, where it sets the stage, was quite informative for me. I'm going to try Jasmine tea next. But the second half was a repeat of almost everything I've read previously. When it comes to the practical aspects of finding your Ikigai, the story is the same. Sleep well, do meaningful work for others, find meaning in your passion (if not, find your passion), stay active, do a little bit of exercise every day, don't eat too much, have a good social circle and so on.
In a way, I wish Ikigai was a longer book. Because at the end, they talk about Buddism and Stoicism in one chapter, bundled together.
If you take Ikigai is a stepping stone to figuring out and reading more about the art of living, then it's a good book for you. But if you've already read about Buddhism, Stoicism, Yoga, mindfulness and so on, you'll get little out of Ikigai other than learning about the Japanese context to it.