This is Ketch's thread but I just wanted to add my impressions.
The mount is gorgeous. Robust. Really well made and...
combines a PL style lock for extra security, so after the lens clicks on you also rotate a PL style lock that really secures it to the body.
It's a professional mount made for a cinema camera, pro all the way, top notch build quality.
It's nicer than the original Canon mount because of these factors.
Did I mention its titanium?
I just wanted to share that this is a very pro piece of kit, really a fantastic value.
No one will be dissapointed. RED did a great job. They listen, respond and deliver.