The Leupold Vendetta Rangefinder is a bowmounted range finder that I recently purchased and installed on my Z7. Pretty easy to install and I currently have it "roughly" sighted in. I am shooting at my block right now and seems to be working great. There are a few reasons I bought this. Range finder on the bow lets me range the deer as he is coming in without having to grab my rangefinder. I usually know what all my trails are, but I feel this will help when I am hunting new areas and will allow be to carry one less thing into the woods. Hoping to do some at home target shooting here soon with a few buddies. I will update how well it works when shooting random ranges on 3D targets.
You range the target by using your 20 yard pin. You hold your 20 yard pin on the target at full draw, click the button, and move to the appropriate pin. Just shot a hundred arrows tonight and stepped off 40 yards and it was very accurate.