I have a Keller pendulum site and love it. If I am over 12' high in a stand it is accurate to 37 yards. After that I have to use one of the two set sight pins. I got an 8 point two weekends ago in my home town in Illinois at 34 yards and was right on. Through both lungs. I have not missed one time with this site since installed last year. I was a sceptic until my brother (who lives in my home town in Illinois still) showed it to me and we were shooting off the roof of his garage at numerous distances. I sent my GF out 30 minutes later after shooting his bow with it on it.
Just make sure if you are in near freezing temps to make sure it swings free when in the stand. Condensation can build up and if temp drops it will make it stick..happened to me once. Was a real heavy fog and then the temp dropped below frezzing and I noticed it wasn't swinging and it froze up a little. Just food for thougt if you run into this condition.