The 80R has the quick release ratcheting system that the Pro-elite clamp has.
The discontinued pro model does not. The model that REI has is just a simple turn knob to tighten clamp mechanism. Simliar to what the spin doctor g3 offers.
To operate the pro elite, you just push, and turn a couple of times to tighten. To release, just turn it counter clockwise to loosen it a little and push the quick release and it will pop right open. Real fast and easy operation.