I've had experience with a HOB Octopus, an Odyssea PS-75, and an Octopus DNW-150. I'm a big fan of the Reef Octopus skimmers. The HOB served me well; however, I prefer the DNW-150 that I am using currently. The DNW-150 produces a ton of bubbles and pulls out some good muck. Also, I like the gate valve on it for adjusting flow and that the cup has a drain so I can funnel skimmate into a 2-liter or some other container if I choose to do so. The PS-75 is a good skimmer for the price. I bought the skimmer new for about $40, and it did a fair job. The Octopus skimmers kick its butt, though.