I pump 3 time a day at work use my Medela PISA , but want a manual pump for occasional use at home and when we travel . I be skeptical because of some of the negative review I see on here , but this little pump have work perfectly every time . I be able to get about 7 oz . within 10 minute -lrb- about 5 minute per side -rrb- . that be about how much I get from my Medela pump after 10 minute while pump both side at the same time ! I 'll come back to update if I ever have problem with it , but so far so good after use it occasionally for about a month now .