You beat me to a review on the 115.
Been trying to find the time to write something up for the past month.
I've had mine up and running for just over a month now and love it. I did get the pc and web interface as I like to use my computer to modify and monitor if I can.
I found the setup really easy and adjustable. I've reconfigured it a few times. Started with the level sensor as main controller for top off, then a back up level for actual top off system, now have it set as a skimmer shut off for a DIY skimmate locker.
Being able to program the arrow keys is also great. Currently only have one set to turn off most things while I do a water change from the sump.
Feel like I've barely scratched the surface of what the controller can do.