I love, love, love zappos! Firstly, as mentioned by so many other reviewers- their return policy is the best i have ever seen. 365 to return your shoes, and free shipping both ways! Secondly, their selection is so wide and expansive- you can find essentially anything on this website. They have many designer brands for a cheaper price, as well. In addition, they make the site very easy to navigate and they also provide you with a feature where you can sign up to receive updates on your favorite brand. For instance, everytime aldo adds new shoe styles to zappos.com, i receive an email informing me of this. It's really wonderful for those of us who continuously buy shoes- especially from one brand.
My advice is this- when it comes to shoes, always use zappos. Their shipping is fast and free, and their return policy is perfect. No other website can beat that. It's no wonder zappos is so popular!