Have been using this unit for 1.5 years now in my custom setup. No problems what so ever. I mounted it in my case at a slight angle with nozzles at lowest point to minimize chance of water bubbles getting into the outgoing nozzle. The slight sound of water flowing is relaxing and lets me know that the pump is functioning properly. I run the D5 (setting 4) with a CPU, Chipset and GPU water blocks in the loop. I also use Fluid XP+ blood red color. Great product Danger Den!