i actually have both a helix and a johnson. I have the helix on a rack and i use the johnson to control a roach bin in another room. Both are good, but i prefer the more constant temps of the helix and will most likely be purchasing a herpstat next.

my room fluctuates about 10 degrees over the course of the day so i need the constant flow of electricity. I fear that my snakes would be at the wrong temps of i left them with the on/off unit.