I am almost (90%) exclusively pumping and using a hospital grade medela pump which is big and requires me to stay in one place whilst I pump (plugged in to electric). As I would like to continue giving breast milk to my baby I am thinking about investing in the Elvie double handsfree pump and am looking for anyone's experience with it and would you recommend it? I would like the double pump to ensure I keep getting a good yield of milk. With my current pump i can get anything from 130 to 290 ml in one session of double pumping. Have you found the Elvie pump to be efficient?