I am looking for feedback on pendulum sights. I currently use pin sights which I like. However, I have missed several deer as a result of misjudging distances. Most pendulum sights claim accuracy out to 30-40 yrds. after initial sight in. I would appreciate any information.

I use a Cobra. I shoot a extremely fast bow. Over 300 fps with a 400 grain arrow. It is good from under the tree to about 30 yards. Past that its not accurate. I cant imagine anyone getting anywhere near 40 yards with one. Where I hunt it is so thick i cant shoot past about 20 yards anyway.
I would recommend one for treestand hunting, but as soom as the season is over my Copper John goes back on. Mine will be back on next year, as Im out of tags this year.

I'm not good at judging distances either. I missed 2 does earlier in the season by using the wrong pin - went out and bought the Trophy Ridge pendulum and made a perfect shot on a doe the very next morning. It has been a real confidence booster for me.

The one I got allows you to move the pin up or down for ground hunting as well. I really like it so far.

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.