I love my Dr Browns. I am exclusively pumping and mine had colic and this really helped cut down on her gassiness. Also, it's suppose to retain more vitamins. But, glass is a much better conductor of heat so when you have a crying little one, it's nice when it heats up faster. I know they are only a few really good ones out there. Slow flow nipples are really good to have if you are going to be breastfeeding because they have to work a little harder for the milk.