Instruct: Classify a review into positive or negative sentiment.
Query: Excellent mp3 player ! But upgrade the firmware ...

I had a need for a small AA-driven mp3 player, and this one certainly fit the bill ! I had trouble loading it to full capacity until I upgraded the firmware. I installed v3.180 and have since had zero problems. I am completely happy with this player. It is extremely easy to use and has great sound.