The premise is nice, but downsides noted in another comment, usability is also a problem.

It's much heavier than a normal notebook, and the surface is basically an extremely fine grit sandpaper. It works great with pencils and ballpoints, but wetter pens (gel, rollerball) do not dry as quick. Also, forget fountain pens. You'll be eating away your nib as I write on that paper.

I have a couple of these notebooks, but they sit unused for now.