This is great to use in the office or when you're on the go and have to carry your baby while pumping. However, I have with issues with spilling and milk being stuck on the valve. My left side produces a lot more and i got almost 8 oz at once today. You have to move it slowly when you take it off because the milk will overflow and spill through the spout. This was less than the max amount per the cup instructions. It's supposed to be able to hold 8 oz. Then when I pour it to the bottle, it also spills everywhere. I guess because the cup was full, there was too much pressure when you tilt the cup to pour the milk out. I also found a lot of milk got stuck inside the valve. Had to take apart the pump to put them into the bottle. If you don't fill up to more than 7 oz i think it's fine and it won't spill easily but the valve issue is still there.