@Tiger-Paws - Not sure where you would say $1000 compared to Apex. You could actually do the Mega Set which is equivalent to the Apex, if you do not want to Color display also. The Mega Set $849 and I please there was a 15% coupon off on items which means the set would have been around $722.
So the difference is approx 12 dollars. Is that a better comparison? The Apex would come with two extra controlled outlets (8 Controlled Outlets) on the EB832, the P4 has only 5 control outlets 1 always on for 6 total. The P4 comes with a display on the unit, and the ability to plug in expansion modules without having aqua bus cables and modules.
You can see some of the other comparisons in my post:
https://www.reef2reef.com/threads/switching-controllers.316106/
Hope this helps