I've been using Herpstat II's for a quite a while. I am not that far away from sypder robotics, so it's easy for me to pick one up. In several years of using the Herpstat II's, I did have one side fail off, which is rather unusual, but I will be taking it to GLK herp to be looked at this weekend. (No real harm was done..the side that failed happened to be controlling the temps on a gopher snake).