Well, I've had a Muzzy Zero on for 2 years now. I see no problems with it. I know several others that have it.... no problem. I think it's the greatest thing going. My hunting partner and I both have them.... they have never let us down. Between us we've taken over 20 deer in the last couple years in all kinds of weather. His 11 year old has one and took his first bow deer this year too. What more could you want.