I picked one up for $2.49.
This is basically Carl's Jr.'s take on In-N-Out Double Double as it includes the same combination of ingredients and for the most part, it works.
The lettuce was fresh and crisp and the tomato was surprisingly flavorful on this occasion (usually it's just very mild).
The onions and the Thousand Island dressing contributed to a savory sweetness although the onions didn't have any of the charring you sometimes get with grilling. The cheese was pretty standard, which is to say, fairly mild. It was melted but not quite to that gooey goodness.
Overall, Carl's Jr.'s California Classic Double Cheeseburger was respectable and enjoyable but their bun was sub-standard. It's a nice value for the price and a little more filling and meaty than a Big Mac.
Nutritional Info - Carl's Jr. California Classic Double Cheeseburger (283g)
Calories - 620 (from Fat - 350)
Fat - 39g (Saturated Fat - 15g)
Sodium - 1130mg
Carbs - 41g (Sugar - 12g)
Protein - 29g