I've been using these as journals for a couple of months now. I go through about one a month, and I find the size to be just about perfect--they're thin, fit just about anywhere you want to put them, and really lie flat. They look nice sitting on a desk, too--the proportions are so close to the Golden Mean that it's clearly not an accident (21cm / 13cm = 1.615). I think I'd prefer slightly longer lines (they feel just barely too short to me when I'm writing), but the current size and proportions are so aesthetically pleasing that it's not worth it.