Hey mummies.. Im thinking of getting a freemie and hack to my spectra 9+. Do i just buy the cups only or i still have to buy the whole set? Any reviews on freemie is appreciated too. Thanks!!

I used freemie with medela pump. But I have both sets. I think you can just get the cups? Try first? Mechanics wise, it's just like any other pump, bend forward too much and it will bottleneck the tubing