i'm all ACI now, never thought or planned for it though. always just had manual controls and a heap indoor/outdoor temp-rh sender. it's only recent since Bandit hooked me up with the controller he outgrew. it has the four slots, i'm only using three of them ATM. and in the hydro side i have the aci controller with the two built in sockets. with these two i can read temp/rh from each cabinet and control heat/cooling/rh and all the circulation fans. i've also upgraded my exhausts to aci.
i didn't think being able to see/adjust these things remotely would ever get used but it turns out i use it way more than i ever thought i would. i don't even touch the controllers themselves anymore. and the ability to see charts and history and set up alerts or trigger notifications is just icing on the cake for me.
aci got me hook line and sinker!! hahaha