Tunzes are definitly pricy this unit including a single controler and a deco rock and photo cell retails areound 500 bucks. The price is the only disadvantage. It produces some whoping 3100 gallons per hour and can completly hidden by the deco rock. You hardly even can tell the pump is in the tank. I have mine set up to pulse at 30% output - 100% and at nite it automaticly cuts back to 30% when the lights turn off. A nice wide flow pattern. Its by far the most impressive powerheads I have used ever. I would rate it an A+
