I bought when they first came out.It was extremely heavy and made a constant buzzing sound.On top of that,it was very loud when the pendulem was unlocked to swing.I got 32 yards out of it from a tree which was no advantage what so ever to a fixed pin.I also hated the way they positioned the yardage marking on the side of the sight.It made it very inconvenient to quicklyadjust the sight with as little movement as possible.TR's customer service was excellent.They sent me two new sights and one new sight head.Regardless,it was way over-priced,too heavy and awkward to adjust in the field.The pendulem gives you no practicle advantage from a tree if you shoot a relatively fast bow and use proper form.Overall,I think the sight was a big flop.There's far better sights out there for way less money.