Instruct: Classify Amazon reviews into positive or negative sentiment
Query: What a gem!

We saw 'Serenity' over the holidays, and promptly bought the 'Firefly' dvd boxed set. What joy - to discover such a wonderful series now. What heartbreak - to know that only these few episodes exist. We tried to ration them out to make them last longer, but couldn't stop ourselves from watching another and then another, and another. We just finished watching the last episode and are devastated - there is no more! It went way too fast. Yes, it could be classified as science fiction; and yes, there is occasionally, sexual content, but give it a try. The characters are diverse, yet each engaging in their own way, and the cast is superb. It is a series that is so enjoyable as to almost be addicting. We are certainly going through severe withdrawal. It is a gem.