Herpstats are considered the 'Gold Standard'. That said: I don't own any. I have ~16 VE-200's and 1 VE-300 and most of them have been operating for 7-8 years. My oldest VE-200 which is around 11+ years has an issue that it displays the heating element as 'active' constantly-when it is not. I can reboot the device and correct the issue for a few months before it happens again-temperature is always within range, just a minor issue. I get crazy power spikes and brownouts in my area and some of my VEs blow some internal fuses and deactivate through failure every few years, but, they are an easy fix to pry open the back fuse compartment with a flathead screwdriver and pop in a new one.
I am not sure if Herpstats are the same, but, my VE-200's throw off a good deal of heat-this seems rather odd to me for even low power regulation activities...
If you are controlling both a CHE and UTH then you need a thermostat with two separate zones. I cannot comment on the VE-300x2-as I have never owned one.
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