Instruct: Classify the given review as either positive or negative.
Query: Bad Design

I have replaced two of these nozzles and am now on my third one that has stopped working. It has a poor design that causes the nozzle to be stuck on. You can hold the black button continuously or click the yellow button to lock it in place. The problem occurs when you go to unlock it, it gets stuck and will not release. I am replacing these with cheaper, higher quality nozzles.