Those Johnson or Ranco, does it turn on and shut off? Say, set a low and high and that's it?

Seems to me that the extra money for the Helix or Herpstat is the better choice. Hmm...

missi, I have to agree with the dimmer/rheostat tweaking. It gets some what annoying. If the Helix or Herpstat is set and go, then you probably want to take a real good look into getting one. I'm looking at my wallet right now actually. I might take the plunge myself.