I normally wear a 7.5 in women's (an 8 in tennis shoes) but thought I would try out the kids size due to the price difference.  I have a pair of Sperry Top-Sider Bluefish in a women's 7.5.  The differences are: the insole is leather in the women's, which is more comfortable, but not sure enough to justify the price.  In the kids, the insole is fabric.  Also, I found that the kids ran a little wider than the women's size.  To me there were plusses and minuses to this.  The kids size made my feet look smaller while the women's size looks larger due to them being narrower they look longer.  Comfort wise I would say that the women's are a bit more comfortable, but I've worn the kids one's more.  The kids are a bit wide on my feet because my feet are a little narrow, but they are still comfortable.  Probably because it is fall I've worn the kids pair more since they are the chocolate color, while my women's size one's are the linen/oat color.  I really love them so far.  They are so cute and comfortable.  I find that they go with everything.  I will definitely buy another pair in a different color.