I have both, and I like the Herpstat better because on the Helix you have to press and hold the button down to adjust the temps, it has to go from the current temp to 110 and then back to 65 and then up in +1 increments, which isnt a big deal but it's enough for me to prefer the Herpstat. On the Herpstat you just hit the plus or minus and go up or down.