I think every aquarium should have one.
They can turn lights on and off, control heaters, chillers and fans, watch pH
The Apex in particular can tell you exactly how much power each outlet is using and has a sophisticated but simple programming language that lets set all kinds of "if this condition exist - do this" actions.
Not to mention if anything goes wrong it will send you a email and/or text message letting you know.
I like the e-mail options. I would really like to just log on my smart phone and check status like temps, flow, power use. I love the options! Thanks for the reply!