I loved this book!
I would consider myself an intermidiate Go programmer, but I think this book would suit any Go developer, from "What is this Go everyone's talking about" to experienced Go devs.
I absolutely loved the way that each concept was introduced in a stepwise fashion, one chapter building upon the next.
Also, as a reader of technical books, I appreciate the actual writing. This writing was engaging and entertaining. It made reading a pleasure.
If there were six stars, I'd give six, but sadly I can only give five.