Complete binding setups come with our latest model, the 840.
The biggest differences between the 750 and 840 are the material and shapes.
The new 840 release mechanism is constructed with arms of stainless steel.
The shape of the 840 release arms have also been designed more vertically to keep the heel strongly connected to the plate. It will be also good for you if you like to keep your rear foot big toe near of the heel of your front shell.
Note that Reflex is not making the 750 release anymore, some of our dealers do still have some in stock though.