This product is very comfortable!  I ordered the L/XL which runs slightly big on me.  however, because of the way the product is designed and it's flexibility to adjust the sizing in different areas (front zipper and the two back velcros), it helps the bra fit perfect and snug.  It is a really useful thing to have especially if you are going to pump.  As a matter of fact, I am pumping with the bra on and able to write this review at the same time!!!  Highly recommended for mommies who like to multitask!!!