I've used a Keller site for about 10 years. Since I do 99% of my hunting from the air it has eliminated the need for distance estimations. It's very easy to sight-in; very similar to how you move fixed-pin sights. Mine is a little noisy, but shooting at deer less than 25 yards away has not been a problem. I believe the new Keller's has a bushing between the site and the bow that cuts down the noise. Good luck and welcome to the Board.