Hey, lulu33! Good topic, right to the point...I was just thinking about starting it here but you were the first
And as for the question, yes I have really faced this kind of situation when I bought some packs of coffee of a brand I bought before from another vendour...An absolutely diferent taste, and no pleasure from drinking it at all. After taking the coffee, I felt sick and couldn't recover myself for another week...When I finally got better, I throw those packs away and made a vow not to but it from that place anymore...
And you know, nothing really showed that coffee wasn't ok until I tasted it....