I went through it a long time ago and found it really beneficial. I really recommend it, especially for beginners, but shadowing in general is good for pretty much any level. The only problem I have is getting myself to do it for 10 minutes a day.
A little while ago I downloaded the Core 6000 deck when it was shared and I've been using that in a similar way to the book. I have the audio on the front, and the sentence, reading and translation on the back. It's mostly stuff I know, but I mainly use it to practise my pronunciation, and doing new cards can be good for listening comprehension. It's also allowed me to learn the pitch accent for words I didn't learn with audio.
A little while ago I downloaded the Core 6000 deck when it was shared and I've been using that in a similar way to the book. I have the audio on the front, and the sentence, reading and translation on the back. It's mostly stuff I know, but I mainly use it to practise my pronunciation, and doing new cards can be good for listening comprehension. It's also allowed me to learn the pitch accent for words I didn't learn with audio.