I originally bought the large ruled notebook, but found that the line spaces were a little on the narrow side for me. Having now got hold of the plain version, it's obvious that this is the one I should have bought in the first place; I much prefer a blank space rather than blank lines. But each to their own.
Having used mine for a few weeks, I can find no fault with the classic Moleskine design or the quality of the workmanship. I like the off-white paper which is neither too thin or too thick. The overall size of this notebook - rather than the pocket version - is perfect, neither too large or too small. And there are enough pages to store my genius ideas or inane ramblings for a long time, if not years. If you tend to jot things down on scraps of paper, as I do, you can either stuff them in the expandable pocket at the back or between the pages - and the elastic keeper will prevent anything falling out. In short, it's a joy to own and use. I've seen other notebooks that might be 'finer' (and more expensive) but this is a supremely practical notebook designed for heavy, every day use by the thinkers of the species. And it's unlikely to fall apart after a couple of months as cheaper notebooks do. I wouldn't be without mine. Long live Moleskine.
Note: The Amazon description states that this notebook, and others in the Moleskine range, are leather bound. Well, mine isn't. It's 'merely' hardback. But don't let that put you off. Personally, it makes no difference to me.