I have more than 10 of the hydrofarms. My racks all run herpstats but I use the hydrofarms as a secondary probe on each rack. If one gets knocked free I have a backup to cut the power. I also have them on a few other enclosures as the primary thermostat. It has been 2 years, I just checked the date of my amazon order for the first one I bought. All have been running non-stop and no failures here.