I've heard gread things about breastflow.
We had a ton of issues anyway and poor baby was totally confused, lol. We like the Playtex drop-ins... you burp the air out of the bag and there is no air to be let in. With the bottles where air has to trickle back in, I found it trained my son to pop on and off my breast since that was what he was used to. Nice, wide nipples... latex is softer than the silicone teats/nipples (more like breast), but the silicone comes in a slower flow