It works, however, my old sports bra that I cut two small holes in works just as good, if not better. Its easier to put on then this, and easier to wash, and a heck of a lot cheaper also.
Update 7/10/2014
My sports bra with two cut out holes in it, from my I first started pumping with my son, 2 1/2 yrs ago, is still around. I used it when I had my daughter, and it still help up. This product works, but Im all about saving money, guess Im cheap like that ;)