Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Cold brewed coffee lacks a lot of complex flavors

The system itself has good intentions and isn't overly cheap, but it is certainly not going to make the complex cup of coffee that a french press or Chemex will.I have never had a problem with the acidity of coffee, and when I tried cold-brewed, it was the bland taste that lacked all the complex flavor notes that drove me away. Maybe for iced coffee - maybe - but not for the add-hot-water-to-concentrate crowd that has cropped up. You are short-changing the complex flavors that only hot water can extract.