We just bought the Keurig B-60 single shot coffeemaker. Love the design, the ease of brewing. But my wife and I both think the coffee has a very unpleasant undertaste. We switched from tap to bottled water and tried several different kinds of cofee, but didn''t notice any difference We wonder if we may be getting a taste of residue from the plastic resevoir. Or maybe the machine just plan doesn''t make good coffee! Anyone else have this problem with Keurig?