yah some car salesmen are pretty damn cool. A guy at penske honda let me drive a s2000 when I was only 15 years old.. I was by myself too. He let me drive it very aggressively too lol, he let me though because after talking for several days he knew that I knew more about the car and cars in general than he did haha.
I hope the fact that you beat a stock civic si from a dig isnt the only reason for your purchase though.. but it's okay because your purchase all in all was the right one haha. Enjoy it and take care of her.