I have recently started using them with good results. I would like to know how much amperage eHoefler was running through his. Regardless, switch life is greatly shortened by high amperage. Also, a high amperage heater will make it switch more frequently than a smaller heater, further reducing switch life. Staying with as small of heater as you are comfortable with will help on both issues. I like that the Thermo Cube has a second outlet. They suggest using it for an indicator light so that you can visually confirm that it is still working. I put my heater as far from the Thermo Cube as I could to be sure that the entire compartment got warm and to reduce cycling. I did choose a heater with a thermostat I set for 90 degrees to be sure that I don't overheat that spot of the compartment.
The most common Thermo Cubes come on at 35 degrees to prevent freezing, other temperatures are available if you want to keep things a little warmer.
