Let me start by saying, this pump is a LIFESAVER. As someone who struggled with low output using other pumps (looking at you, Momcozy M5), the Dr. Brown's Customflow doubled my output immediately - 4oz per side on the first try versus my usual 1-2oz. That 'empty' feeling after pumping? Finally achieved it.

The hospital-strength suction is no joke, yet somehow remains comfortable. The silicone flanges took some getting used to - I ended up using inserts from my old pump for perfect fit - but once dialed in, they create an amazing seal. Pro tip: Play with the adjustable cycle speeds to find your sweet spot.

Two huge wins: 1) It's QUIET (night pumping without waking baby = priceless) and 2) The expression modes actually mimic a baby's nursing rhythm. My sessions went from 40+ minutes down to 20 while getting better output. The included bottles + preemie nipple were a nice bonus since we already use Dr. Brown's bottles.

Now the cons: It's not truly portable (battery sold separately - major oversight) and the tubing can feel like an IV tether when you're trying to comfort a crying newborn mid-pump (been there, spilled that milk). The flanges could use more size options included.

After trying multiple pumps across four pregnancies (per one reviewer), this stands out as the most efficient while being surprisingly affordable compared to hospital-grade rentals. Just buy extra parts upfront - you'll want them!