This is a great product, with a caveat.1. Most likely, If you are a videographer who has been shooting with a 5D and want to step up to a FS100, you now have an upgrade path, and AF really isn't needed.
2. If you have Cannon lenses and own a NEX body, this could allow you to use your nex as a backup, think, macro or landscape photography.
Personally, I fall into number 2, I am going to have to wait and see. $399 is high for my blood, but if I were in catagory 1 above, I would be first in line.
This is not for people shooting sports, action or kids. The MF with peaking is very good, but still not pro level.