As people say, every beginning is hard. I remember this customer and I spent who knows how many hours with same guy from TAC troubleshooting smart-1 cloud mgmt, but in all fairness, back then, there was only couple of people from TAC who had access to back end. These days, its way better, as more people have access, plus, customers can actually restart the mgmt instance from the portal. Keep in mind, restarting it does NOT mean reboot, its actually cpstop/cpstart process, if you need it rebooted, you need to call TAC.
Anyway, all in all, all our clients are very happy with it.
Andy