The real key are the multiple aiming points. That is why a crossbow scope is nice. With a Lumizone or Varizone, those multiple aiming points are able to be adjusted with the power ring. In addition, it is nice to have your turrets set up for a crossbow. I think my varizone turrets are 1/2 " at 20 yards per click. As you can see that is much coarser that a riflescope's turrets.There is just something easier to me about adjusting 2 clicks vs. 16 with a 1/4@100 riflescope.