I ordered the size S+ which says it fits band sizes 32-36.  I definitely think it's closer to the 36 side of things though because the band is kind of loose and tends to ride up on me. (I was a 32 pre-pregnancy and a 34 while pregnant.)

The cup comes up quite high (much higher than my regular bras) and kind of digs into my armpit.  I'm 5'3", so maybe this isn't a problem for taller moms, but it's not like I'm exceptionally short either, so I think this could have been designed better

Overall I'm happy with the level of stretchyness and support and overall quality of construction.  I also like the clips and that the cups fold all the way down out of the way when nursing.  Other nursing bras don't always leave enough room for me to get a proper latch without fabric getting in the way.