I am going to buy a Impact archery cosmic inpact or the collector sight off e-bay. I can see a problem with the cosmic if you try to change yardage with a deer coming in but would like to try the one vertical pin. Could someone tell me a couple of things about these sights. Is the cosmic heavy(say compared to the Spott-Hogg real deal)-is it easy to move and lock down-is the collector as bright as the cosmic and will I have any troble mounting the bracket for my Alpine 5 arrow quiver on either sight. I would really appricate any help. Don