Thanks, my boss got the customer to upgrade. We have a ICORE on a residential system with three zones, because he was able to sell it. Sometimes it depends on the size of the system . The ESP LX comes in an 8 station base. I forget how many an ESP comes with base, but sometimes by the time you add in the cost of expansion modules you could have had the fancy. IMO I don't understand how you could prewire a controller unless you had a splice box and the base of the controller and you attached conduit and ran the wire so all you had to do was splice in the box, but I don't like doing work twice, if I make a mistake.