So far, after a few days of usage, the most apparent feature I could use is the temperature detection to control things. Right now, the tank is still empty and doesn't have a chiller. For testing purpose, I've already program it to shutdown half of the 4 Actinic PC and 1 or 2 of the 3 HQI when it gets too hot. Two days ago the tank hit 86F and it did shut down the 2 of the HQI gradually. It sent me emails letting me know about them as well. Very neat!
You can put in as many "IF" statement in there as you want. Let's say your temperature is higher than 88, you may want to shut down all the lights.
Last night it got quite cool in my area and it shut down the cooling fans on my sump downstairs. Got an email telling me about it. Good stuff! :D
When I have the chiller and heaters connected, I'm sure they will be in those "IF" statement as well. :)