I just purchased a Nikon yesterday, it has tremendous optics. I've been asking every salesman around if the extra money was worth buying the a range finder with arc. The guy yesterday told me it was a marketing scam, it's not worth your money unless you shoot bow competitively. I've learned from salesman that the arc calculates the angle of the shot and how gravity effects your projectile to give you a more correct distance. This in my eyes won't work because The different grains in bullets, arrows, field tips, broad heads, and different grains of powders. The fact of the matter as long as a range finder has a laser you are already taking into consideration the angle. I hope I could help your decision take it for what it is worth.