Instruct: Classify a given Amazon review into positive or negative sentiment.
Query: Serves its purpose

I purchased this item for someone after using one just like it for a year. I am very satisified with the experience; the card never locked files, is recognized by all modern (and up to 1 year old) Sony Cybershot cameras and (up to 3 years old) computers. I even got it to work on Mac OS X v10.3 ("Panther"). Even with 6M resolution, the card can take approximately 170 pictures which can suffice a weeklong trip.