I too think the profilux is too expensive. Don't get me wrong I think it is the best controller on the market but by the time you buy all the options and modules you will be over $ 2000 plus invested.
I personally like the Apex over the RKE. The apex allows you to track things over the period of 24 hours. Take ph for example, the apex will show you a graph of you ph levels over the past 24 hours allowing you to see how your ph dips a night. This will allow you to see how your tank changes over the day.
A RKE will only show what ever is on the screen at the moment. I have also heard that the probes on the RKE suck.
As far as set up RKE is the easiest to do and does have great customer service. The APEX doesn't have the best customer service but does have a great forum (can't remember it right now but google it) with great users that can help with any issues.
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