Fotodiox Nikon-to-Canon lens adapter

I received the Fotodiox.com Nikon-to-Canon lens adapter I ordered (the “Pro” model). At $89, the price was considerably more appealing than the $175 asked by Stephen Gandy of CameraQuest. And it comes in a printed box and therefore looks like a real product, whereas Gandy’s adapter comes wrapped in bubble-pack, newspaper, and perhaps a re-used shipping box! But the shipping material and box do not go on the camera, so—

Appearances can be deceiving—I have several CameraQuest adapters and all have served me well—their build quality is excellent. The FotoDiox adapter looks nearly identical in quality, but it won’t lock onto the lens—so the lens could just drop right off the camera! I tried 4 lenses, and the FotoDiox adapter would not lock onto any of them. My Friday phone call to FotoDiox.com has as yet gone unreturned. My advice: stick with CameraQuest for lens adapters.