I posted a question about drop away rests without a rope or cord a few weeks ago. All of the feedback I received recommended a Muzzy Zero Effect. Since I was installing it on a BowTech Guardian, I purchased a model 600PC. First, let me say I have set up many, many bows with all different kinds of rests and sights. I followed the DVD instructions to the letter and I really struggled with this rest. I am only a 27" draw length and I don't know if that is a factor. But, when I was able to get the rest to lift the arrow up to the rest holes, it would not drop far enough to give me vane clearance. I shoot 2" Blazers and I realize they are a little higher profile than some other vanes. Regardless, after many hours and three times adjusting and readjusting eveything I could, I finally was able to get clearance. However, after tuning and shooting a dozen groups or so, I took it off and reinstalled my WB. I guess if it isn't broke, don't fix it.