Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Courteous reseller

I purchased these pocket microscopes to give to my grandchildren. I found them wanting in optical quality. Specifically, the 'scope suffers from soft focus and chromatic aberration. Perhaps it would be useful if you knew exactly what you were looking for and just wanted to verify the presence or absence of a given microscopic substance, property, or flaw. Not good enough for general exploratory or educational use. The narrow field of view alone would make it challenging for a child to understand what they were looking at.That said, the seller provided the utmost service in fully addressing my dissatisfaction. I will gladly purchase from this seller again. I will, however, try to make a better guess at what performance can be anticipated from a very low cost item.