They work great.  I actually get more mile out by just leaving these puppies on and letting the pump rip than by trying to hold them (I think I get tired and don't wait for a 2nd or 3rd letdown).  They do give my the Uniboob though.  I love the adujustable strap locations over the bra so I can wear different summer dresses, tanks, and tops. The center zip peize allows my nipples to face their natural direction.  They work great on my plus sized frame (above the size ordered were no problem).  The velcro back is comfortable and not scratchy.  I ordered 3 more after trialing one pair.