DC brushless motor technology has come a long way. More energy efficient, more pumping power, variable speed, and the quietest pump I've ever owned - amazing! I turned it up to full flow and I couldn't even tell it was on. Very well made, precision castings, unobtrusive wiring and controller. Only con is the price, but compared to other DC pumps used by reefers, it's not too bad. One year warranty isn't bad either. Bought the 1050, 1900 gph pumps.