Just got this up and running and I’m impressed. I have a 32.5 gallon Fluval Flex AIO tank and was apprehensive about buying this because of the reviews stating it was too powerful. Not true. This thing is giving me great surface agitation, absolutely zero dead spots in the tank now and doesn’t blow sand everywhere to boot. I can turn it low enough that it’s just a gentle current. From the start it stirred up all kinds of detritus that’s now been cleared by my filter and not sitting in the tank anymore. I didn’t have any issues connecting to wi-fi as others seem to have had. The app is disappointing though. All it allows is on/off and connecting other Jebao products like lights, dosing pumps and such. I did have an issue at startup with it making some noise and the impeller seeming to bind up on lower setting. Some silicone lubricant on the plastic ends of the impellers solved it immediately. Smooth and quiet as a mouse now. Other then that everything was pretty self explanatory so really no need for instructions short of what the various settings are. And if I upgrade to a lager tank I have the ability to slave multiple units together. Can’t speak for longevity yet but what a steal for $80! Compare to others for $300. They’re almost disposable at that price point.Way better and less intrusive then a standard power head.Now that I have it in hand I’ve realized most bad reviews are from people who have no idea how to use these. Worst case scenario if it’s too much you can take one of the two impellers off and cut flow in half. Nozzles are completely adjustable for direction of flow so there’s absolutely no reason to “run it upside down” as one review I saw stated.Just adhere to the recommended tank sizes. When it says minimum 80 cm it means it. With these it’s more about matching the appropriate tank dimensions then it is about gallons per hour. Turnover doesn’t matter here. Just flow pattern. And that is size dependent. The goal isn’t to turnover the total volume of water x amount of times per hour. It’s to engineer a perfect wave pattern to make your corals feel at home.Cheers and happy reefing!Update as of 1/17/2024:Still performing well with no issues. Not a day off since purchase. Good little unit. Recommend highly.