Instruct: Classify Amazon reviews into positive or negative sentiment
Query: No quality control

I bought this kit last week and it arrived defective right out of the box. The compressor was leaking right at the first connection out of the tank, which could not be tightened. It would not build pressure and run constantly (and loudly). I had to return it. It's impossible that such an issue would not have been found during testing, which means there was no quality control whatsoever.