Sorry, I have very little knowledge on the Herpstats aside from that they are good thermostats. I personally use Johnsons t'stats for my enclosures, $80 from Boaphile. Works very well for individual setups, but is workable for multiple enclosures as well. From what I have heard, the Ranco is basically the same as the Johnsons, while Herpstats and Helixes are slightly more advanced.