My list is really long for reasons why I love the apex.
Youve got to get a few of the add ons if you are going to want to monitor and track a bunch of stuff-
-I love the apex because I can see where my PH was bouncing around in my Calcium reactor, adjust the bubble/flow accordingly.
-I can also see when the power went out, click a button for feed mode, click a different button for water change mode,
-Theres a float switch in my skimmate container so if it gets full it turns the skimmer off.
- I also put in controls for if the tank is low (something is leaking or wrong) sends me a text and shuts off certain equipment.
-I hooked up my webcam to it so I could see my tank anywhere.
-My Chiller and heaters dont fight each other anymore
-I can tier the cooling system, in summer at 78 degrees the fans over the sump turn on, and if it keeps getting hotter at 81 the chiller turns on
-Instead of having 4 different timers for my lights its all programmed through the apex, so frag tank lights (reverse schedule of the main tank) main tank, t5's, night lights
-Ive had my apex alarm text me, my wife called a minute later and said something was making noise, I verified the pump making noise and turned it off via my cell phone (I didnt want her to start unplugging stuff)
The apex is really good if you like to actually monitor temp, ph, and all sorts of other things. It also is good if you have some time to build in your programs takes a few days at first but its autopilot from there on.