Day 1. Can't get normal gas flow to more than a couple of burners at a time.  It varies, sometimes only one and sometimes I get to 5, but only for a few seconds. The flow trips the regulator. I don't know if the regulator is broken or not sized for the system.  We can use the sear box though.  It's all we've been able to use on this massive, expensive grill. So, so irritating.   
The grill is beautiful and was well thought out enough to be pretty easy to put together.  The videos helped more than the instructions.  It is a gorgeous grill... that is pretty much a useless deck ornament for now.  I will update if Monument or Wayfair makes it right.