Let me start by saying these replacement parts are a lifesaver for any pumping mom. I've been using them with my MOMMED S21 pump for weeks now, and the difference in comfort and performance is night-and-day compared to my old worn-out parts.

The 24mm flanges fit perfectly without that awkward pinching sensation some cheaper brands have. And can we talk about the silicone? So soft against sensitive skin - no more red marks after long pumping sessions!

What really impressed me was the anti-backflow design. I accidentally knocked over my pump (mom life, right?) and zero milk spilled into the motor. The duckbill valves work like a charm - I'm getting better suction and about 0.5oz more per session compared to my old parts.

Now let's be real - at 3am feedings, you want parts that are easy to clean. These rinse off beautifully and dry quickly between uses. After daily sterilization for a month, they still look and perform like new.

The only minor gripe? One set had slightly tighter duckbill valves that needed a couple uses to loosen up. But considering you get two complete sets in the package, it's still fantastic value.

Pro tip: These also fit Momcozy pumps perfectly based on other reviews (though always double-check compatibility). For moms exclusively pumping, having multiple fresh sets means less constant washing - worth every penny!