**EDIT** I would just like to say that in my primary review, my only tiny complaint was that the cover was not as durable as I would like..3/4 through a semester and the notebook cover can look pretty ragged. On my last order, one of the two notebooks came with 5 (count em' FIVE!) card stock covers before you even get to the pocket cover. I find this comical and very amusing. This has only reaffirmed my allegiance to this notebook of superior quality.I had been using another MEAD quadrille graph notebook for a couple years for note-taking in my science classes (mostly math and chemistry) but was a little bummed to find the grid-lines suddenly appeared to be darker (the very reason I had been using the product was because of its paler lines)I was very happy when these arrived. The grid-lines are unobtrusive and the paper seems to be of good quality (doesn't tear when using a heavy eraser). I was also happy to find there is a small "pocket folder" behind the main cover, great for holding a course syllabus (although I wouldn't cram too much into this folder).Perforated edges for nice, clean tears. This was very pleasing.I use 0.9mm lead and it shows up great on this paper. There is no blurring of pen/pencil stroke vs. grid-line, which is why this notebook will be perfect for me this upcoming semester.If I could suggest one minor improvement, I would like to see the cover made a bit more durable. I have no doubt it would easily protect most of the pages during a light rain or snow, but the cover is made of a card-stock-like material.I should mention the cover pictured is one of two covers, behind the pictured cover is a professional looking black cover with a simple blue stripe near the bottom edge with "Cambridge" centered. I labeled over this as it seemed a nice place to distinguish which notebook was for which class (I bought two). If you were to leave both covers on (they are made of the same material) it may offer a bit more protection, but I am not too worried about this affecting the quality of this notebook.