Four stars because I’m almost positive I received a ‘returned’ product. The bag smelt like musty cologne but I didn’t have time to go through the return process. So I washed the bag and boiled the cups for 5 minutes (per the instructions). So far these collection cups have been amazing! I usually nurse every 2.5 hours and will use a collection cup on the other side to catch the let down. I’ve collected 1-2 ounces almost every time and it doesn’t hurt or feel like my body is producing more milk which is wonderful. I haven’t not needed to use my breast pump at all yet since I’ve been collecting so much milk. The cups are not super slim so you could wear them out if you needed (you should never be embarrassed about collecting food for you kid if you need to). The cups are super soft silicone and very easy to clean, I usually rinse them immediately with extra hot water once the baby is done nursing and let them air dry. These are wonderful because they don’t get kicked off easily like the haakaa. I usually just wear a tight t-shirt and that’s enough to hold them in place. I wish I had these with my first baby because I feel like I wouldn’t have wasted so much milk. The one thing I have to say is practice a few pours with water first because sometimes it doesn’t go directly down the arrow or it comes out faster than you’d expect. But once you have it down, it’s fairly simple. I would recommend these to any mom!