The pros are; 1) very comfortable, 2) inexpensive, 3) cups are removable for washing, 4) soft fabric.  The cons include 1) lack of support and shaping if you are heavy in the chest, 2) the removable cups are significantly smaller than the cup area, and this shows when you are wearing them.  My advice, if you are a C/D cup or bigger these are not for you.  If you do order them, take the cups out, so the outline doesn't show.