You are given a review of Amazon's food products. Your task is to divide them into two classes: negative or positive, depending on the content of the review.

I had been buying these treats for my cavachon for the past two years. He loved them.  The last batch was of noticeably lower quality...dry and crunchy rather than moist and chewy. I don't know if this is due to the shift in manufacturing from the US to China or coincidental. In any event, I will not be buying these any more and have switched to other treats.  Note, Amazon would not let me return this item, and I am within the 30 day purchase period. I'm not pleased.
Negative

I have tried various brands of stevia, but I always come back to NuNaturals.  I buy the 12 ounce container because I use it to sweeten everything.  If you have a sweet tooth as I do but don't need the added pounds, then this is the ticket for you.  I drink a lot of tea, and this is my sweetener.  A lot of other stevia brands leave a bitter after taste, but this is the best that I have found to resolve that problem.  Highly recommended.
Positive

These K-cups are either extremely old or they're not authentic Green Mountain K-cups. The coffee is weak and has a bad after-taste. Both my spouse and I have noticed this independently of each other.  I tried to contact the seller to ask about this but couldn't figure out who it was.

Negative