No, this was not my first firing. A roaring initial fire that big will certainly crack your oven from thermal shock. A new oven needs to be cured with several small firings over several days initially. I've been using the oven for about 6 months now.
I'm so jealous of your oven. Wish I could have one in my back yard. That's ONE gorgeous oven!! Using my grill alone sets my neighbor off.
We had our fire pit going a few weeks ago, when the weather was in the 80's. It was perfect that night to have the pit going. She called us at 10:30pm complaining about the smoke smell bothering her. My husband invited her over. She hung up on him! LOL!!