Alright, let's talk about these duckbill valves! I was skeptical at first since they're not original Lansinoh parts, but boy was I pleasantly surprised.

First off - compatibility is spot on for my Lansinoh Signature Pro pump. They fit snugger than the originals which actually improved suction for me. No more worrying about milk backflow!

The material feels premium - soft silicone that's definitely baby-safe. Washed them several times already and no weird odors or changes in texture.

Cleaning tip: Finger washing works way better than brushes (learned that the hard way). The boiling method keeps them sanitized without damage.

Only con? They run slightly narrower than OEM parts. Took some getting used to but now I prefer the tighter fit. And at this price for 6 pieces? Way better than constantly replacing torn original valves!

Final verdict: 4.8/5 stars. Not perfect but absolutely worth it for pumping moms on a budget who want reliable performance.