Instruct: Classify the given Amazon review as either positive or negative.
Query: Do not purchase!

I never bother to write reviews, but this time, it really got my goat... We succeeded in opening exactly ONE bottle with it. Then it was over. This thing just doesn't work! And to add insult to injury, it cannot be returned... I wish I had read the fine print! Frankly, Amazon.com shouldn't sell stuff that may not be returned (but I am puzzled: why were they able to ship it, while we are not?)