Anyone ever play with one of these?

http://www.bushnell.com/products/rangefinders/yardage-pro-riflescope/204124/

This gadget just looks like the cats me ow to me!

Range finder, Bullet-drop compensation turrets, in a scope.
Looking over the manual, it looks like you can custom make your own turrets, it comes with several pre-defined, but also a blank, so you can make your own..

Just wondered if any one has played with one?