I went to the Toyota museum where they actually have one of these cars as a cross section. I would never drive one. It's like driving around with a massive bomb under the rear seat. Forget thermal runway from batteries, I wonder how big the crater of the explosion from one these would be.
Safer than liquid fuel. There are videos out there of what a leak+fire looks like on a hydrogen and gasoline car. You would rather be trapped in the hydrogen car.