I currently am running hydor smart wave controller with 2 koralia 850's. This set up has been great lasting many years but as all things go they are all starting to fail at the same time. It gives me an opportunity to upgrade my flow, which isn't as wide as I'd like for my sps. Does anyone have any experience with the Jebao RW-4? I like the sound of the controllability and also the price. I'm thinking I would do 2 and use the master slave setting on them.