For the record, I have never had any malfunction, nor do I know of anyone who had one malfunction until I heard of it on the boards. I do not believe that they are crucial, but they are a necessary tool if you want to avoid risks.
I beg to differ. Plug your uth into the wall and measure the temp on the uth i bet it gets to 120*.
That means your temp inside would be like 115*?
All it takes is that snake to go under the substrate and you got cooked snake