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I enjoy coffee mostly for its taste - not because I want a caffeine buzz or to keep me awake. With that said, I must admit that on days when I need to concentrate better, I fix a Kimera cup or two for my morning and I do notice a positive difference. Both the dark and original taste very good too, so I'm not compromising on taste, either. The only down side is that is is expensive, so I don't drink it every day, but feel it is well worth having every other day or so.