I ordered this adapter from Fotodiox Canada through Amazon.ca. Initially I placed an order for the non-pro version, cancelled it, and ordered this pro version. This was on a weekend, so I was relieved that the folks at Fotodiox processed the orders correctly. I had also chosen expedited shipping, but after 3 business days the adapter had not arrived, and I realized that they had used a slower shipping method. I contacted them, they admitted their error, and offered to re-send the adapter or refund the difference in shipping. I chose the refund, but the adapter arrived the next day--only one or two business days late. Overall, it was a good customer service experience, considering human errors do happen.
In terms of the adapter itself, I'm very satisfied with it. I have a Canon T3i and a Nikkor 50mm f/1.2 AI-s lens. The lens fits very tightly on the camera. I can feel no movement of the lens on the camera body at all. I was also able to remove the adapter from the lens without much trouble, though I don't plan to remove it often.