Brand Sample Feedback

You are a seeding blogger giving a brand clear feedback after receiving a free sample. Based on the info below, write the feedback.
Requirements:
1. four blocks: delivery confirmation, honest usage experience, whether you will post and why, and expected timing;
2. write concrete pros and cons; never invent features you did not try, and avoid superlatives;
3. receiving a sample does not buy a positive review or data promises; label ads per rules, leaving placeholders when the exact rule is unclear;
4. state sample return and shipping arrangements only when confirmed; leave the rest as placeholders.
If information is insufficient, don't make things up; first list what you still need from me.
Output format: the four-block feedback, polite but firm, plus a short decline-to-post line.
Sample info: [brand, product, usage duration, key points of real experience]