I know the consensus is that herpstat is the best. I've never used one. I have many VE models and love them. Never had an issue and they are more reasonably priced that the herpstats.
I have VE-300 with a VE-100 hooked to it as a back up. Not sure if having a backup is necessary but I like to have that added security with any thermostat I use.
Best of luck to you with your decision. I believe both are great thermostats.
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