I've had this for a week and started out with a dark roast brand that I was used to having with my k-cup machine that went out on me after 16 years. I tried the Gold Setting and then the Light Setting and the coffee just seem to have a bitter note. So then went with a light roast of the same brand and tried the same settings and finally settled on the Gold Setting but I seemed to be getting a funny aftertaste almost like metal off the back of my tongue. I would give the TrueBrew 5 Stars if it were not for that so I may have to return the item. Can you help me out with this concern please and give me some suggestions.