I've bought a couple of used bags on ebay. They were definitely authentic and in very good condition, but I did eventually re-sell them. It's great getting them for a bargain, but somehow I am not as "happy" with them (yes, the shallow side of me takes great joy in smelling and touching a brand new bag). Somehow the tiny scratches, or the slightly fading hardware (or whatever minor sign of use) ends up bothering me. That said, I've sold my own used bags on ebay and those who've purchased seem to be very happy so I guess it really all depends...