We seem to lack the best format for leaving feedback, we all say whether it was a pleasurable transaction but that isn't the only information we require when examining feedback.
I for one REALLY want to know if the item I am considering is vastly more expensive than the other items sold as this might indicate a well prepared scam.
I also find it preferable dealing within a sellers usual area of expertise.
Third and last (fourth if you count the icon) comes general experience.
Therefore I submit the format should be
price including postage - category or item - general comments.
e.g. $500AUD - laptop computer - well described, well packaged, good communication & I hope to do business with her again.