Coffee, and hot chocolate, and tea all had a very bad taste. I looked up the problem, and it seems many have experienced the same issue, and it was suggested to run lots of water (some added vinegar, but I did not) through the machine to eliminate the taste. After about 10 large carafes, the taste was normal. Then the next time I returned to use it a few days later, the horrendous taste again was present. It makes me through out the drink as it is awful tasting. Other than the awful taste of the water that comes through the machine, the machine is great. But I care most about the taste of the product.