I bought these cups to use with my Spectra S1. I hate having to sit and be unable to move for 20 mins when there is so much to do. I love that these collection cups allow me to be mobile and hands free. They’re pretty comfortable and don’t hurt. I also get more milk using the cups versus the flanges my Spectra comes with. The spout also makes it super easy to pour out. I have three complaints, though. 1 - They’re pretty bulky, so I have to wear a bra that’s larger than my usual size to ensure it’s not pressing down on my breast (I get clogged ducts often). 2 - There are so many parts that need to be cleaned (six separate parts; seven including the flange insert). 3 - Maybe I’m doing it wrong, but the flange tends to hold milk after pumping, and if you’re not careful when pouring, it will spill out instead of going into whatever you’re pouring into. I’m giving this a 4 star because although I have a few complaints, it is pretty easy to look past since I have found ways to overcome them, minus the multiple parts, of course.