The main thing is - what is a description of how they fit?
I have a closet full of 'suggested' shoes and 'seemed to fit' (at the store) that I cannot wear and are a waste of my money (Goodwill should get them, I guess).
Where can we find reviews in detail?
Zappo's does have a user's review ability for every shoe they sell, as well as detailed descriptions on the last, composition, etc.
Even with info, its still a 'crapshoot'.