If you write down any type of sensitive information, this might be the notebook for you. I jotted down info about a surprise gift for my little brother, but one day I caught him flipping through it when I left it on my desk. That was the first time I tried the microwave feature (for the notebook, not my brother), and I must say that I was skeptical that it would do what Rocket Book claimed it could. After about 30 seconds, I took it out and found all of the contents erased (I uploaded the important pages to the cloud beforehand). The book was definitely warm, but it didn't appear to be altered or disfigured afterwards.
This notebook is great for confidential writings like a diary or embarrassing love poems. The pen functions and writes like any typical pen, so it would be great for work if you ever feel like that NDA you signed might be broken if someone gets the hands on your notes. HOWEVER, the product also says there's a recovery feature where you can freeze the notebook and it comes back. I haven't used this feature yet, and if it works it would be helpful to me. But, I do not recommend buying this product if you have personal trust issues or if the person you buy it for has trust issues themselves. Otherwise, you will be finding the notebook in the freezer every time you go to grab a microwave meal.
Tl;dr: great product, writes fine, notebook works as advertised. Don't buy if you have trust issues.