I think this is the best iOS grammar course that exists. After struggling on my own for quite some time (10 months), I took this course and was surprised by how many new things I learned. I felt like I had improved a few steps after taking this course, and I liked how many new things I had to learn. At the same time, there were times when I felt burdened when I tried to apply it to my personal projects. If you are thinking about taking this course, I think you absolutely must take it. Think briefly, pay quickly.