I have a wide array of thermostats - 1 Herpstat, 2 Johnson, 2 Ranco, and 4 ZooMed ReptiTemp.
The really cheap stats, like the RZilla and such, are not worth the money. However, the ZooMed stats I have are all working great and haven't given me a lick of trouble in the 1.5 years I've had them going.
As for the high end stats, Herpstat is certainly better to get than Helix.. but I actually prefer my Johnson stats over even the Herpstat. I've had to set my Herpstat at 106 to keep 92 in my rack, but the Johnson keeps 82 set at 85. Strange...![]()