Looks like a good product. Ive had several problems with heaters (jager, stealth, and hydor theo). Either they stop working even though the red light is on and it wont heat up or they simply wont turn off!
Best decision I ever made was to allow my RK controller to control my heater. At least this way if the heater isn't working my controller will let me know.
To sum it all up: NEVER trust your heater!