These bottles have worked perfect for our baby. He is also breastfed and there have been no issues switching between the two. I would recommend these in a heartbeat. We have also used [...] bottles and were not impressed.
Overall, these are great bottles. For those who complained about leaking, needs to make sure the rubber peice is DRY before reasembling! Other then that, it dosen't leak. I also liked the wide opening, which makes it easier to put the fomula or milk in and he has no problem going from breast to bottle and that is my biggest challenge with him.These are the only bottles that work for both me and my baby and i would recomend these to anyone who is doing both supplementing and breastfeeding.