Tried 3 different K-cups from the sampler pack that came with the unit and they all tasted bad with a funny smell. Brewed just a cup of hot water with the unit and tasted it. YUCK!!! plastic!!!. Ran white vinegar through unit and let sit for 4 hours but it still tasted like plastic. Called Keruig and they if you've tried the white vinegar trick and it still taste like plastic you have to send it back.So I sent the B40 back.We have a B60 at the office and my father also has one and they both work fine so I ordered one of those. I received the B60 last night. Tested it with just water. YUCK!!!! Plastic again. Running vinegar cycle through unit today while I'm at work to see if that fixes it.Very disappointing.