I have to agree with Donna.
Usually itīs the price, but my wife already made bad experiences with such online-shops.
She ordered one pair of leather boots and got fake-plastic shoes.
We wanted to send them back, but it didnīt work...
We gave up after 2 month.
I think it depends on the online-shop, if itīs a well known quality shop you can be sure that your shoes will be real leather (i hope).
But my wife doesnīt buy shoes online anymore. (good for me and my money)