Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Terrible Firmware Quality

Cons:1. Unit freezes, requiring hard reset every so often.2. After a album ends, it does not play the next album.3. Play all plays songs by alphabetical order of their titles. This makes it useless for audio books.4. No Eastern languages support.Pros:1. Decent audio quality. Some buzzing is heard, but not too noticable.2. Decent battery life.