Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Not the best!

We bought these bottles because of the advertisements in all my pregnancy magazines that said how great they are. Unfortunately, we did not read the reviews because I would have found out how terrible they really are!The slow flow nipple is so slow it was taking an hour to feed my daughter 3 oz. of formula. The fast flow nipple was so fast she would choke. There is not a happy medium. You can't make the hole bigger in the slow flow nipple because it is silicone and will tear and boiling doesn't make the fast flow hole smaller.The bottles have 5 pieces and are a pain to clean. Also, you cannot use a bottle warmer to heat them up because of the silicone bottom piece.We did have a couple of leaks, but this was because the bottles were not assembled properly...another downfall of having 5 pieces!!!We ended up using the playtex disposables and have not had one problem. There is a variety of nipple shapes and flow speeds. We are very happy with them and would highly recommend them instead.