They're nice to look at until they get to the point where they're becoming disproportionately large for the woman's body.  I prefer the hourglass look on women - the bust and hips should be large and curvy (not these two-by-fours who walk around claiming to be women).  Once either becomes TOO large, however, it's not only not appealing (to me) but it takes a toll on the spine, knees and feet.  Also, gravity ALWAYS catches up in the end.  The heavier something is, the more gravity's working on it. :P