When I ordered this, I was a little concerned I would be receiving a knock-off or a fake since it costs about $25 more in the store. But I received it quickly and it was authentic. The cologne itself quickly became one of my favorites (as well as a favorite for my wife..which is really what matters). The scent is fresh, clean, and with a bit of spice without being overpowering. I can spray it on in the afternoon, and the scent is still there the next morning. I like it better than the original Eternity and it absolutely slaughters Obsession (also by CK), but I never really liked Obsession to begin with. If you like Pi by Givenchy, especially the newer versions like Pi Neo or Pi Neo Tropical, you will probably love Aqua.