Hi there! Well I would definitely recommend it, I think it’s really helpful when you’re first starting out and as a reference when you get more advanced. It can be a bit slow at first because it goes over all the basics in detail, but it’s worth sticking with it because it’s super helpful in the long run! It covers the basics of particles and conjugation and other key grammar points so you can use it to apply the different rules and explanations when you use Korean yourself. It’s really easy to follow and the way it’s written isn’t like any of the other books I’ve used (it’s really casual so it’s easy to read), but if you do buy it I would suggest using other resources as well. But I’m only about half way through so I haven’t reached the more ‘advanced’ chapters yet, although based on the chapters I have done I would recommend it to anyone learning Korean, beginners or otherwise!