I’ve tried many Momcozy pumps and my home pump is the pink Spectra. Honestly, I LOVE my M5 I usually connect it to the Spectra. The cups are SUPER comfortable, and right now I also have the M9 and I love it, but I think it has too many parts to wash 
Which one is your favorite?
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The S9 is my ultimate favorite pump!
Youll notice most pumps have roughly the same amount of parts to clean, give or take a piece. Having said that, I do like my M6, it just have cup, flange, diaphragm, and duckbill - 4 pieces. I use insert so 5 pieces per pump for me! I like that it doesnt have any hard to reach spots so even handwashing is quick.