I was a 10 year plus Canon user when I decided to go up to the 1D MkIII instead of waiting for the 5D's replacement. I needed a bigger buffer than what the 30D offered, and I needed more than the 3fps the 5D had. So I got the 1D MkIII.
And mine did have the AF problem. It went in for service before the recall, then it had the recall work done. The recall work did not fix the problem. I lost too many shots where the focus point was properly on my subject and the camera decided to focus elsewhere in the image. So in the end, while the pics it creates are beautiful (when they are in focus!), I decided to switch brands because I have to be able to trust my camera. If I wanted a manual focus camera, I would have gotten one. (Also I can swear that the images were focused in the viewfinder on the major ones it missed).
Canon didn't seem to care too much that their camera was broken, which is especially poor considering the "professional" designation that this camera has. After the recall repair, and then having continuing missed images, I sent it in again for another repair before switching. I finally decided to switch after Canon posted the blurb officially that the 1D MkIII's AF was the best of any previous Canon camera. This was a slap in my face, especially considering my own personal problems with mine, and the fact I had better results from my old EOS-3.