I would never use any heater with a built in controller.
Link below is the controller and titanium heating element I use.
The Aqaumedic controller is about the best stand alone heater controller out there.
http://www.aquacave.com/300w-titanium-h ... r-358.html
I have read way too many stories of reef tanks that have been completely wiped out by a cheap heater that either cracked or stuck on.