I was in the fashion business for years dealing with some highend designers and stores. This is where I learned about this site. I even know of a highend department store that recommends this site for their customers to consign the items they no longer want so they can buy new ones from them. Sometimes an A list celebrity will sell items here and give the money to their favorite charity. I would never, ever buy a high end item anywhere else on line that wasn't directly from the designer or a well established retailer (I'm talking about you, famous site that starts with an "e") I have seen amazing counterfeits of shoes, bags and jewelry that come complete with boxes, dust bags, authenticity cards, etc...The only downside about this site is that for some reason all sales on handbags are final, but you can return clothes, shoes, jewelry etc..for a refund, not just a site credit like some others. I have asked about this, and they say it's because they don't want someone to use the bag and then return it, but all they have to do is put a large tag on it that you can't remove unless you keep it (?!) So be very careful going over all the photos of the bags, measurements, etc. I will say however, I did buy one bag a few years ago that I didn't feel was described correctly regarding the condition, and they did take it back, but this is rare.
If you have champagne taste, but not the budget, this place is a goldmine.