Instruct: Classify a given Amazon review into positive or negative sentiment.
Query: Buyers beware. These are not well built.

The first ionizer I got lasted about 2 weeks. Their customer support was not helpful but did offer to exchange it. The second one I got lasted about 3 weeks and now keeps cycling. It runs for about 10 seconds, then its off for about 5 seconds. They are built with low quality parts and their customer service is third rate. I would not only avoid buying this but also avoid the company all together.