Yes. I used too.
I had/have a CHHC-1, EVC-2, and PPM-1 environment controllers.
The EVC-2 and PPM-1 work hand in hand with eachother.
Since I could only run so many things off the CHHC-1, it popped the breaker sometimes, so I got the 2 controllers that work together so I didnt overload the thing anymore.
I ended up selling the CHHC-1 and just have the other two now.
I also use 2- PXM-1 power expanders. Love these things.
Yo bro, how much are you running off your controller? Have you ever had issue with overloading it?
EDIT****
Never mind again....thats what the 2- PXM-1 power expanders are for.....never knew those existed. Very cool.