Instruct: Classify Amazon reviews into positive or negative sentiment
Query: disappointment

Our kit didn't work well at all. We were only able to get the 'flashing light' and the 'clicking telegraph' to work, and then even after extensive tinkering. The radio set-up took about an hour, and never worked despite much extra effort.We had much better luck with the ScienceWiz Physics kit, but this Inventions kit was a big disappointment.