I've been using this product for about four months since returning to work after having my baby, and it's done its job nicely.  It's good to have the expanding option, although I find I would fit best in something that was in between the two size options.  I've never had a problem with keeping suction, and once it's in place I'm able to work at my computer/desk and be productive while I pump.  It's also super soft and I feel gives good coverage (I'm 36D--maybe less coverage if you're bustier) so I don't feel like I'm naked in the workplace.