It's really not that complex, as I understand it.
There are many different bracket choices, (verticle and horizontal) each representing a different target size, (18 inches , 36 inches, etc.). You simply estimate your target size, zoom your target area to fit the bracket of that size, which automatically cams the scope elevation to accomodate for bullet drop. It is actually very accurate and precise. Understand, this is all accomplished after the scope is calibrated to your specific cartridge and sighted in properly at 200 meters.
Example: A coyote is standing broadside at an unknown range beyond 200 meters. I would guess a coyote to be about 36 inches long. I zoom the coyote to fit the known 36 inch bracket, whala the scope has automatically adjusted the elevation to accomodate striking the coyote.
Additionally, once the range is adjusted, a simple turn of a thunbscrew and I can zoom in or out further without changing the automatic range adjustment just made.
Once you get the hang of it, it is really quick and easy.