Anyone use the simply smart similac bottles??

[Gei89]

I plan to exclusivley breastfeed my little guy up until I go back to work and then from there I will be pumping and sending that to daycare. I bought some simply smart similac bottles and was wondering if any of you ladies have used them and like them or don't like them? What did you think of them, I have heard some mixed reviews on them, but would like to get more advice on how people that have used them like them or not. Thanks ladies!