Instruct: Classify Amazon reviews into positive or negative sentiment
Query: careless design

Even though I bought this thing at the discounted price of $22, it wasn't worth it.First, the thing is very noisy. I used it as a white noise machine, which was nice for me, but it's probably not intended to be that.Second, and it's an inexcusably silly design oversight, a screw in the machine that makes constant contact with the water is metal. It rusts very easily, making the filter very orange, the water orange and most likely emitting orange humidity.The machine is built very cheaply, quickly and carelessly.