Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Thrilled Grandma

I purchased this DVD for my grandson who is autistic. While not every autistic person responds to signing, my grandson does. so far, the results are fantastic! In three weeks his vocabulary has increased by nearly 50%, using both the signs and speaking the words. His parents are completely thrilled by the results. Another plus, his 2 year old sister's vocabulary has increased as well. I will eventually buy the whole set for them. Thanks so much Rachel and company!!