Something we've seen in this area seems to be difference in moms' ability to maintian milk supply long term for tiny premie with Lactina...but do better with classic. We have classic in postpartum & NICU and have hypothesized that whatever they start with is what they respond best to. Alternative hypothesis is that there really is a difference in efficiency because of difference in suction curve/release etc. Anyone else seeing a pattern? Also would like to hear (e-mail) from anyone using the select or new Pump in Style system. TIA.