Everybody here adores Herpstats. And with good reason I mean they are high quality thermostats.
But I love my rancos. I own a single and double ranco and I'm just not sure I'd trade them for a herpstat. Especially since the double ranco acts as it's own failsafe.
When I get my rack I am definatly connecting it to a double ranco.
Thats just one newbs opinion though. Herpstat is awesome to.