This actually throws me off a little as I prefer fainter lines

Personally, I think the lines are too dark--it's fine for the ruled book, but the grid is awful especially if you're using pencil

Fine Line Drawing Pen

Also grid lines up through the front and back of the pages, so no annoying double lines

The paper is okay, but I find the lines both too dark and too tightly spaced

The lines for the squares are very dark

only thing I dont like is that the lines are pretty dark, and too close together

I know there are people who don't like lined or quad paper for their bullet journal, but those people have artistic skill, and I struggle just to read my own handwriting.