I use small notebooks to document client projects. These are lightweight and inexpensive. I also give them to participants in my training programs for note taking and journaling. The small size fits neatly in purses backpacks portfolios without getting lost. Paper quality is OK for smooth writing with pencil or pens.
I am am old lady going back to school to get my Bachelors degree. (Finally!) These are the notebooks I use for taking notes from my studying. The size is great. Not too small and not too big. The pages have a preforation in case I want to tear out a page. Also I do a lot of journaling. This is easier to pack around than a full size notebook. I leave the main journal at home. If inspiration hits me I take one of these out. Write my words. Then tear the page out and put in the main journal with tape or staples.
I'm in love with these little booklets. they fit nicely into a blazer or coat pocket. Strangely enough the simplicity of design and their non-precious nature allows me to let my thoughts free without worrying about needing them all to be momentous - as I would using a Moleskine for instance. It works for me and I like that.