I've never broken a rod in my shelter. I don't know anyone who has. The problem I've seen with shelters is the fabric and the pockets where the rods set into the fabric and the grommets for the anchors.
An unbreakable rod is cool, no doubt, but that is not the weakness of the shelters I've been around.
Show me a shelter where the rod pockets and corners don't tear out and the anchor grommets will last more than 1 season. That's what I want to see.
Looks like a really nice shelter, though.