Feedback is very important. If a I receive no feedback or low feedback that may prevent my ability to continue selling on Ebay or at least at a high level. If you do not want to leave a perfect feedback please let me know BEFORE leaving feedback so that I have an opportunity to fix the issue. Remember that on eBay feedback is partially used to fulfill a seller's requirements to Ebay and by rating the shopping experience and interaction you had with the seller as described in the feedback rating and you are contributing to the sellers success or failure! It is not a review of the postal service or product other than what is described in the listing.
Also, when rating my shipping cost or time, please keep in mind shipping materials and the time I take to package and deliver your items to the postal service. Anything after that is the responsibility of the postal service.