In a market seemingly flooded with high-page-count A5 notebooks, I am always on the lookout for the elusive perfect 100+ sheet B5 offering. I work in a laboratory where B5 is standard-issue, but most lab notebooks are not designed for fountain pen ink. The Stalogy 365 offers good performance with nearly all fountain pen inks I have thrown at it. Despite the thinness, I have not seen any inks actually bleed through, though some very saturated Noodler's inks in particular will ghost. This paper is often compared to Tomoe River, but Stalogy has faster dry times and thus will flatten inks out a little more than TR. It also has (very) slightly more tooth, which may or may not be to your taste. The grid is unobtrusive, the binding superb, and the cover durable. It opens flat (after breaking-in), and the page corners are nicely rounded. It's not perfect, but until a gridded Tomoe River B5 notebook with this many pages is brought into existence, this is the best option in its class.