I have been in the reef hobby 30+ years and saltwater even longer. I have used several controller and currently also own a Apex.
I was excited to test these out for Coralvue because I loved my WaveEngine and it really helped me eliminate cords on my 7 tank system and allowed my pumps to work together. I now own two WE.
I will say the thing I liked most about the Control unit was how easy it was to set up.
Everything they sent me originally to test would take the average person less than a hour to set up: , Control 4, ATO, Leak detector, skimmer overflow sensor, temperature sensor, ph probe, orp probe, 2 WiFI strips and a single Wifi outlet. No coding, non of that.
I am also using the Hydros to power my Klir's. It works really good and gives me a little more control.
Right now I am working on it controlling my RO/DI system for freshwater.
Seriously it is so easy to set up it is all menu driven. You do not loose any power either and with most outputs their is a advanced button that allows you even more advance control.
Also nice to see how affordable a unit can be especially the Control 2. Since the demise of the ReefKeeper lite there really has not been a affordable unit out there especially for those who do not need allot, those with smaller tanks or just want something affordable. Some have multiple systems and do not want one controller to handle them all in case of failure you can loose all your systems.
Another thing I like is the way the App can combine the two controllers, it is seamless. You do not have to log into each device separate they are all brought together into one app.