have never used a zero affect and don't know anyone who uses one, BUT, i have never heard anything bad about them other than the price and how long it takes to put them on the bow. they come standard with a video that you must watch in order to install the rest correctly. like limb, i use a Tophy Tker and really like it. after my guinea pig (Ghost Walker) gives a report on the Trophy Ridge Dropzone i may switch over.