I'll be the one voice saying I don't like or trust the stealth heaters...but prefer the older visi-therm deluxes. I've had a stealth go bad (heater stuck on) but not a deluxe. Not having the light go on and off gives you one less clue the heater is perpetually on.
Eric
I've had two Stealths go bad on me and the third one has to be set at 75 to keep the tank at 81. I wont buy another one. I just bought a Theo. So far so good with this one. http://www.drsfostersmith.com/Product/Prod_Display.cfm?pcatid=11368&N=2004+113767