I have an apex and love it. You're welcome to come check it out.
I am going to have to add on an extra bank of outlets though, but you can add up to 3000 controllable outlets on the apex in series and it can control them.
Anyway, does a great job. Have to calibrate the pH probe every couple of months, but thats expected.
Never felt the need for a salinity probe, as my tank salinity doesn't shift. I just check the water change water with a refractometer. Maybe once or twice a year I make my water change water slightly saltier to account for water loss to the protein skimmer, feeding, etc, but never really been an issue.
The web interface is great though. Unfortunately qwest kind of sucks, so haven't got remote access working, but as soon as some other provider gets into the central district market, I'll get that set up, and it will be awesome to be able to monitor remotely, especially in the summertime.