Given reviews from Amazon, classify those review based on their content into two classes: Negative or Positive.
Q: This is a great product overall. I was looking all over the place to buy these from stores but could not find it anywhere. My wife and I wanted to use these because the baby had used them while in the hospital and there is no washing or maintenance involved. However they are a bit pricey and the flow is fast relative to other nipples.
A:
Positive