It's the paper!
The paper is what keeps me coming back to this one. Although there is some show-through of FP ink (because the pages are not particularly thick), there is no feathering or bleed through, you get excellent shading and sheen, and it has a good amount of pages that are already numbered. I only wish they came in a lined version with 7 mm lines. My only reason for not giving 5 stars is that I don't care for 5 mm dot grid as much; so if you like 5 mm dot grid, this is a 5-star product for you.