Guess the topic says it all... is paying that much extra for the built in inclinometer worth it (e.g. Bushnell's ARC, Leupold's RXII, etc)? Maybe only if you live in mountainous areas? How critical are the calculations that it provides for accurate shooting? I frankly dont understand how shooting at an incline/decline affects range/POI... can someone kinda explain? Just cant decide if I wanna pay for it or not.