I will, but what's interesting is that I keep getting bugged by PagerDuty sales people and today, just before I read this, I got an email with their "improved" pricing and "improved" service! Had to vent out, sorry!
PagerDuty had to learn this lesson the hard way (circa 2012), as they were entirely in US-East during the catastrophic AWS outage in June. They proceeded to go offline along with a lot of their customers, who subsequently were not alerted.
Multiple region redundancy is not trivial, but it would certainly be a little higher up on my to-do list if it was basically the entire value proposition of my service. I was a little suspicious of PagerDuty's operational chops before, but now I simply don't trust them.