Bought a couple of these to make notes in on research articles I read, but am today going to be buying a stack of them. I am amazed at the paper. The ruling is light grey, and at top and bottom across width of page are tiny tick marks to help you create columns if you wish, and local bullets for lists. While it is slightly off-white-grey it takes ink better than my Rhoda dot pads and other high-quality papers. Using a Pilot Metal Falcon w/ F nib, Noodle's Upper Ganges Blue, normally an ink I find spreading on just about any paper, behaves best on this paper; Lexington Gray, another spreader, works BEAUtifully on this paper! And in fact, since I am writing the first draft of an important document that will be lengthy, I want to use water-proof ink and Lex Gray & UGB are two preferred colors for me -- and they work BEST in this notebook! I am frankly flabbergasted. Other pen/ink combos: Lamy Al-Star EF nib with Liberty Elysium - less line spread here; Habanero, beautiful thin line; Noodler's Ottoman Azure in Pilot Metro, pressed hard for slight flex = the first SLIGHT hint of bleed-through (so for those of you who want to write with a big fat nib, this might not work so well for you); Diamine Classic Green, also pressed hard for slight flex - zip, zero, zilch bleed-through; Black Swan in Australian Roses also in Pilot Metro (all Fs) - beautiful, no bleed, no shadowing, etc. Even Noodler's GI Green, normally a very wet ink, in an Ahab with flex nib = NO bleed-through. I think the only bleeding I got was from the times I had to press hard on a non-flex nib to try and get some variation. The Ahab I didn't need to press hard, but the ink still made a fat wet line, and all was well. This is a workhorse workbook. I don't even mind the lightness of the cover -- I actually like it. And where my bulldog clip may wear it a bit, I just wrap over the edge a piece of wide transparent packing tape, and that takes care of that. I also lay a flat piece of that tape on the outer edge of the inside of the cover, and slap one of those Leuchtturm pen loop thingies on there. The tape holds the loop well, and the loop is then removable for use in the next notebook. Regrettably, the page with all the ink trials was removed, I don't remember why, so if there was any feathering I cannot tell you with which ink/pen. I use primarily PMF/PF pens with soft XF or SF nibs; Pilot Metros in F, Ahabs and Konrads with a few Nib Creapers, and a couple of Waterman F and Ms. Also use primarily Noodler's inks for their water-resistance, but they have a wide range of characteristics. Rabaul Red, for example, works well on here in an Ahab, no feathering, no bleeding unless you super-ultra-hard flex. And yes, the inks -- most of them - dry fairly well better on this paper than on others.While I use other Apica notebooks (have also used Rhodia, Clairefontain but hate the fat wide ruled lines, Moleskine, and lots of Leuchtturn) including the Premium series, this notebook is the one I use for heavy working. I would LOVE it if they made a half-the-number-of-pages version so I could carry it in my daily pack -- the paper, high quality, weighs a big and this notebook is slightly heavier than I'd want for every day carry. Then again, I'm not 30 anymore, either. If your needs and pen use are similar to what I've written above -- I recommend this entirely without reservation. If slightly grey paper will put you off -- don't buy this. Otherwise, IMO worth every penny, in fact the value is superb.