I love these notebooks. They're amazing for drawing with ink. Every art store sells "bleed proof" pads but the Ogami books are the only things that come close on that promise. Dark copics which would leave normally bloody smears on the next page are barely visible ghosts with this. The ink is also far darker and bolder then it would be when soaking into normal paper, and never feathers. Plus the feel of the paper is a dream with every pen. Isographs and Pilot Parallels are a bit scratchy on normal paper and get clogged up as the paper fibers get peeled away, on these they just glide across.
If you're going to use this as a general purpose sketchbook though you should probably look elsewhere. It's weird, for how good they are with pens it's almost like they had to balance it by being terrible for pencils. At least mechanical pencils. Because the paper has no tooth whenever you're drawing with a mechanical pencil you can feel it digging trenches into the page and gripping the paper, and if you're too heavy with it then it's going to poke a hole through to the next page. It might be a bit better if you're using large tipped wooden pencils, but sharp graphite points just doesen't agree with it.