I have had a ReefAngel for close to a year now, all the bells and whistles, dosing pumps, PWM expansion, RF expansion, added on an additional 8 outlets. I believe you can add up to 8 total outlets with the expansion hub.
The only limitation on it is what you can think of, I am going to setup the storm mode once i get all of my LEDs hooked to it, and the owner\inventor answers questions rapidly, not to mention the community on the forums there everyone is top notch. I know nothing about programming but they have a new wizard that you can use to set up outlets to be opposite of other outlets, set a time difference for daylight vs actinic, overheat mode, single or dual switch ATO. cant beat the bang for the buck