It was my birthday about a week ago, and this arrived in the mail yesterday...
My wife was kind enough to get me a 67 Designs "JL Mount Rail Edition".
Straight Out of the Box.
Liberated from the plastic.
Here you can see the backside of the rail that has the 3M VHB tape. Also you'll note three holes on each side tab, one for the factory screw and two outer holes for additional mounting screws (included).
As the written instructions and install video on the manufacturer's website are pretty thorough, I won't bother with an installation write-up except for the fact that I did trim the rubber tray to fit nicely under the rail (not included on the manufacturer's website).
Here is the rail installed with two 20mm T-Track balls.
Rail with attachments, including the "small" Carbon Fiber Arm and the medium Metal Universal Holder
The Universal Holder grips our Samsung S8 and S8+ phones very tight. I don't think there's any way that this holder would let our phones drop. Although you can't see it in the pictures, the holder is lined with rubber on the surfaces that the phone touches.
The fit and finish of the components in this system really are exceptional. Of course I don't have any experience with the durability and longevity yet, but I'll update as necessary. The attachments are easily turned from horizontal to vertical, and can be adjusted to many different positions. So far I like this position, but I reserve the right to change my mind at any time. LOL. I may use the other T-Track ball for a GoPro.