Controllers which do not have ethernet connection are a PITA IMHO.
Also - for the price they should at a minimum provide a built in webserver interface similar to what the 79.00 DSL router/firewall boxes have on them,
so the end users do not have hell adjusting them via a silly up/down +/- 2-line LED interface.
The only value in the LED or LCD on the controller itself, is perhaps a quick glance as you approach the tank that visually,
everything looks OK. - But, of course a good controller would have emailed your cellphone the instant any parameters went out of
your specified limits, and you would know something was going wrong *before* it's
"too late".
If you are going to pump 100's of dollars into something - make sure it does *save* your thousands in coral livestock.
It should at a minimum,
1.) Have an ethernet port
2.) Provide a web interface that allows you to program it via your home computer via either Firefox, Mozilla, or IE.
3.) Have a feature to automatically email you if any parameter goes beyond a limit you decide or if there is a power failure..
(Temp too high/low, or power failure at the house while you are at work so you can run home and start the genny, PH out of whack indicating your
top-off is going crazy, etc,etc..)
4.) Be able to be powered by a UPS and still detect mains power loss to your other equipment.
5.) Provide dry contact inputs to allow you to extend it to monitor any other devices you add that provide contact close-on-alarm outputs
so these can be tied into the controller, and programming based on these devices status added in at your discretion.
ALL of the brands available are really too high-priced for what they do or don't do..