Just finished chipping my 14mm with a Canon EMF AF chip
I had to make a spacer to get the chip's contacts to the correct height, but after that installation and configuration was very easy.
Works like a charm! Very handy to have aperture and focal length data in EXIF. AF confirm and AF adjust also works, but because the DOF is so large there is quite a lot of margin. Live-view x10 works better
I find the focus ring a but spongy, there seems to be a bit of a dead area before it catches and changes focus, is that normal?