Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Perfect!!

Honestly, I love my AVENT bottles, however I DID NOT LOVE MY AVENT PUMP! After returning my AVENT pump and realizing that I would have to go with a different brand I immediately bought these. I rented the Medela hospital pump and these worked perfectly. Much better than having to buy additional bottles just for pumping. I only used these with the hospital pump so I don't know how well they work with other brands. These are also dishwasher safe, which I completely appreciate. When I bought these, it came with four (4) "rings" - 2 for regular AVENT bottles and 2 (I think) for the wide, breast milk storage bottles. As other reviews have mentioned, there was no instruction manual, but really you just screw on the top of the AVENT bottle and screw into the bottom of the pump system - very easy. I would completely recommend these if you plan on using AVENT bottles without the AVENT pump.