The review is very thorough and includes likes and dislikes, ink tests, and even watercolor experimentation!
The pages of the whole planner consist of 90gsm white paper, very fountain pen friendly with no bleedthrough and minimal show-through. The paper shows off shading fairly well (not so much on the sheen factor), with a decent dry-time between around 7 and 11 seconds for fountain pen ink. Most surprisingly, I was able to lay down some watercolors with no bleedthrough and no noticeable buckling of the paper.
To see the review with loads of photos click here.