Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Defective product

The first time this dehydrator was used, the bottom tray melted. I called Amazon and they had me return it for a replacement, at no shipping charge. The second one did exactly the same thing. I called Amazon and they told me to return it, at no charge to me, and I would be refunded the purchase price.I have since purchased this same model dehydrator, here in town, and used it several times. It has worked perfectly. Obviously, Amazon has gotten a defective shipment from the manufacturer. The woman I talked to, at Amazon, told me this item would be listed as unavailable until such time as they found out what the problem was.I received notification, this morning, that my Visa account has been credited for the full amount charged. I would like to add that this is the first time, ever, that I've had a problem with something I purchased from Amazon, and would not hesitate to purchase again.