I wish I'd had this with my first child.  This makes hands free pumping so easy.  I have twins now and have my hands full - I can put this on and get many things done including holding them.  This also allows me to work while I pump and not worry about spilling milk or having the bottles fall off.  I've taken this in the car as well so I can drive while I pump - something that is often essential with 2 babies needing attention as soon as I get home.

I use this over my nursing bra/tank so I don't have to remove any clothing before I pump.