Hi Danny;
We did buy the 56 Behringers in early 2013. I suspect that Guitar Center had to pull in inventory from many stores to fill that order because some of them had been manufactured a couple of years earlier than that. I have to say they've performed quite decently.
The speaker electrical load is spread out over 16 20A breakers so we are only turning on/off a few speakers with each breaker. The in-rush current was certainly something I considered during the planning stage.
Glad you appreciated my article on the install and thanks for mentioning you did.