Yep, I HAD the same controller (ESP) with 8 zones and a Irritrol wireless rain sensor RS1000. I switched it out and installed the Rachio 2 gen towards the beginning of this summer season. Was simple to do, remove zone wires and rain sensor wires from old ESP unit and remove old controller box from wall. Install/mount new Rachio controller box and insert zone wires in zone order as they were on your old controller. As for whatever rain sensor you may have that will need to be wired in per Rachio's support instruction.