I was previously using the Reef Octopus DC 250EXT. The original pump failed in about a year but was covered by warranty and replaced with this new version, it ran another 2 years flawlessly but now sits empty. My system configuration has changed to the Red Sea 250 and I am now using the Reef Octopus Regal 200 SSS spacesaver that is powered by the VarioS-4S pump and I am very happy with it. It runs smooth and is fairly quiet for the amount of water and air it pushes through it. Mine is setup and controlled by Apex, runs at 100% full time and has a 10 minute restart ramp up time in the event of a power fail to prevent overflow into the collection cup. I know it is probably overkill for my system but I have always had good results skimming. I'm not sure if I like the float for the collection cup as the sensor needs to be disconnected from the controller bringing the sensor wire along with the lid to the sink for cleaning but it is an included option. I liked it so much I am also using the VarioS-6S pump for my return pump and the matching controllers just look nice.