Amazon calculates a product’s star ratings using a machine learned model instead of a raw data average. The machine learned model takes into account factors including: the age of a review, helpfulness votes by customers and whether the reviews are from verified purchases.
The lines are minimal, so you aren't forced to write too much. Sometimes its hard to keep track and write everyday, but the questions make it fun to keep track of you attitude and what you're thinking on certain days, throughout 5 years.
I bought one for myself then for my friends more than a year later. It took over a year for the spine to crack but I travel for work so if I was living at home and it was staying in a book case I think it would be okay