I have been looking for a solid return pump for the last year or so. I looked at panworld, eheim, iwaki and went through 2 genx 40 so far. I made the final decision with the hy5000 water blaster pump. Now those of you who know anything about coralvue know these bubble blaster pumps freakin ROCK! The build quality feels top notch and they have silicon nitrid shaft and bearings so calcium deposits don't block the output of the impeller, somthing you dont find in even the most expensive pumps like red dragon. The pump ONLY uses 60 watts and pushes some very serious water. I have it dialed way down and this makes the genx 40 feel like a nano pump, produces virtually no heat barely even feels warm, handles 1300 gph and so far is dead silent. Its is supposed to be one of the most engery efficient pumps on the market. They have a 3yr no questions asked warrenty meaning if anything breaks they replace it with no hassle and there customer serivce is one of the best in the aqaurium indsutry. If your looking for a solid, quiet and very energy efficient pump look no further then the water blaster line of pumps.