I have one in my shop that I use during the build process of my airplanes. I always use a heavy duty switch from JR or Electrodynam.com I don't know if it's my particular switch/regulator, but the switch is the same size as the .40 size airplane switches, the really cheapie ones. And I don't feel like I get a very positive on/off feel to the switching action. That's why I never installed it.

Todd Whitkoff really praises this device, which has always made me wonder if mine is an anomoly. Anyway, FWIW. I have "heard" of switches failing, but I've never come across a failed switch, not even this one.

Sean