Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Broke after less than 20 launches

What a disappointment. I thought I was upgrading from the Stomp Rocket, but was wrong. First, this broke almost immediately, after less than 20 launches. The compressed air mechanism stopped working, I don't know if it blew out or what. This never happened with Stomp Rocket. Second, even when it was not broken, the rockets fit over the launch tube so tightly that in most cases, the kids could not generate enough stomp force to even launch them, causing much disappointment. The instructions say to use corn starch! I say -- hey -- build a toy that works out of the box.I returned this to amazon, and ended up losing about $6 when all was said and done with their return policy.I strongly recommend against buying this product, and suggest instead the Stomp Rocket. That gave us hundreds of good launches. When it got worn out, I thought I was upgrading with this set, but boy, what a mistake.