Pros: mimics the breast
I bought some of these bottles before I went back to work. It ended up being the only bottle my LO would take for a while. I love that it requires both compression and suction to make it work and it is the closest bottle to the breast in my opinion (or rather my daughter's). They are a little on the pricey side to invest in if you are not sure it is going to work for your LO, It was however wonderful for my DD who only really had these bottles for expressed milk and me. They do require a little extra cleaning, but its not so bad. I also used to toss it into the Medela microwave steam bag to sterilize.