Okay, so I needed replacement flanges for my Momcozy M5 and took a chance on these after reading mixed reviews. Here's the real tea:

🌟 THE GOOD: These are WAY more durable than OEM parts! The silicone feels thicker and grips better - no slipping mid-pump. I bought the 4-size pack (15/17/19/21mm) and having multiple sizes is clutch for when swelling changes.

🔥 PRO TIP: Boil them for 5 mins when they arrive - removes any factory smell and makes them extra soft. Cleaning is easy with just fingertips (no brushes!).

⚠️ WATCH OUT: Some users report fit issues - mine clicked in perfectly but check the gap around your pump's motor part. The 21mm size runs slightly larger than OEM in my experience.

💸 VALUE WIN: At this price point, being able to replace frequently is huge. I keep one set sterilizing while using another - game changer for exclusive pumpers!

Final verdict? 4/5 stars - loses one star because they should REALLY add 13mm/14mm sizes for petite moms. But overall? Way better than paying OEM prices for flanges that wear out fast.