Just went by Ugrip today to fit some accessories, especially getting a working handheld solution for the ET 19mm system. The RedRail didn't fit the bill unfortunately.
Here is what we came up with:
With RED cradle. Balances like a dream on the shoulder. Has a large amount of inertia.
With Ugrip FS-1 cradle. Also balances well, but your shoulder will be positioned further forward.
The foam shoulder pads are my own design. Two water curt foam pads with velcro on the top side. They have a tight fit in the arri dovetail and can be be removed with a firm twist, and can be adjusted back and forth.
Contact me if anyone is interested...they fit the ET 15mm and 19mm bridges.
Their firestore FS-1 cradle works great with the RedDrive:
I will use this with my steadicam setup...just need my angled power cables and I can ditch the battery...
Check out their system at www.ugrip.dk