Sorry to necropost but I've got a Kaya 50# & used it on and off for at least the last 10 years. Dry fired 2x by accident . Never even looked like breaking. Maybe a good vintage
My windfighter was a tank. It's been dry fired 4 times, left in very hot & cold temperature, dropped, smacked, used to smack something else, pressed and so on. Then it delaminated after 3 years. I was upset because it broke but it gave me more than what I paid for condidering what it took.
I guess YEMV.