Like s lot of people have said, these shoes run small.  I normally wear a 9, I had to get a 10.  I have a friend who wears her normal size.  I think it all depends on the shape of your foot.  They are really light and really comfy.  And the soles are really quiet, which is important for sneaking up on people if you are a ninja.  I haven't run in them yet, but I used them for my workout last night and they worked really well.  They don't have the traction I was hoping for, but I can wipe the bottoms off and they "stick" a little better.

A note I would like to add, after wearing these shoes to run in and work out, I still LOVE them, but they are very slippery on tile when wet.  Like in a bathroom.  So be careful.  My most favorite shoes.  EVER