Mostly positive experience with ebay and samples. Maybe the worst experience was when I ordered samples of Hermes Eau D' Vert Orange and was sent samples of Eau de Gentiane Blanche instead. Maybe some would argue that I got lucky in the process!
I've purchased many samples threw ebay and always ended up with legitimate stuff that's packaged well. Actually a few of the sellers will contact me after and let me know of there decant list and offer slightly lower prices then what they offer on ebay. This is against ebay policy but still its nice to skip the middle man.