Stuart,

My FF is still going strong, although I've been using it on 35mm lenses instead of the canon for the past few months since I'm using a 35mm adapter for most things now.

As far as returning to focus marks, since the Cannon lens is not a mechanical focus, its a bit more difficult to know where you started and ended up and then return to the start point unless you attached the stops to the FF itself (comes with the FF).

Occasionally, I will take the adapter off and use the friction wheel, but it's rare these days.

Thanks Marcel :)

Will the Indifocuspro follow focus fit on Camvision rail systems?

The Camvision rails look better quality than the Indifocus ones.

I'm not familiar with that rail system, but if it's a standard 15mm system, I don't know why it wouldn't.