Helix is all I use. I might try a herpstat some day, but I love helix and I've never had an issue with them.
Typically when thermostats fail they run at full power. An easy solution, which is what I do with any of my thermostats, is put a lamp dimmer between the flexwatt and the thermostat. That way if it fails your flexwatt won't get hotter than whatever you have your dimmer set to. I usually set it at 100 because it won't kill the BPs, and it won't interfere with my thermostat if the room temp fluctuates a bit. When dimmers fail they cut the power, I know both of those by personal experience. In the beginning I almost lost the start of my collection to a cheap thermostat, but had a back up dimmer because a friend advised me to do so a couple weeks prior to the incident.
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