Jack has some work to do on his sausage, it doesn't have much in the way of seasoning and flavor beyond salt. A little garlic, onion, sage, or [insert non-salt spice here] would go a long way. Also, my specific sausage patty was a gross grayish-brown color instead of a normal brown (I still ate it though). It tasted blah with a rubbery texture.
I liked the croissant though. It was nice, layered, and buttery with a bit of sweetness. While it didn't feel exactly flaky or crisp, I still enjoyed its soft and squishy, but textured mouth-feel.
As always, I enjoyed the real fried egg which is fried on the crispy side and the cheese was the same melted, processed American you find anywhere.
At the same price as Jack in the Box's lackluster biscuit version, I would go for the croissant over Jack's biscuit every time.
Jack in the Box Restaurant Locator
Nutritional Info - Jack in the Box's Sausage Croissant (166g)
Calories - 565 (from Fat - 357)
Fat - 39g (Saturated Fat - 16g)
Sodium - 776mg
Carbs - 32g (Sugar - 3g)
Protein - 20g