Hi, Zero, good question. The answers so far are great, but I'll add my two cents.
When testing the ultrasonic welding, I have pounded several Codas hard against the concrete (repeatedly: bang, bang, bang, bang, bang...) to break them open so I could test the weld strength. On a few occasions, I have whipped a Coda against a concrete floor a couple of times. They bounced and still played fine. They're not easy to break. In fact, I quickly gave up the slam-it-against-the-concrete method of opening them up in favor of sawing them in half 1st so I could cut them with clippers and rip the parts apart with pliers.
Are they as tough as our poly-Gs? I'm not sure. The poly-Gs are so narrow, solid, and compact. However, I designed Coda to be tough enough for everyday carry, and it definitely is. For probably the last year, I've been carrying one most of the time via the Coda clip. No injuries to the flute yet. As I go running, to the grocery store, work around the shop, etc., I'm not a bit worried about damaging it. The foodsafe plastic resin is also very tough.
With that said, I don't want to over state my case either. If common sense whispers in your ear that maybe you shouldn't toss Coda into a boiling pot of gut-blistering chili, I'd listen! At some point, I'm pretty sure we'll do some controlled punishment testing, but we just launched, and I've got my hands full. So carry Coda with confidence, but --for now-- I don't want to incite anyone to throw Coda against a brick wall or drive over it with their monster truck on purpose.