I bought two for $5 (it's priced at $3.69 for one).
If the components seem a little familiar, it's because the Extra Long Cheeseburger is essentially two Whopper Jr.'s with cheese (but without tomato) on a long bun (from the Original Chicken Sandwich) rather than two separate buns.
Unfortunately, the beef patties get lost in the shuffle. They're pretty small and the hoagie bun felt thicker than Burger King's regular burger bun. Throw in a regular slice of American cheese on each patty and there's very little in the way of beefiness going on. It felt a little like eating a cheese sandwich with Whopper-style condiments.
Nutritional Info - Burger King Extra Long Cheeseburger (214g)
Calories - 590 (from Fat - 300)
Fat - 33g (Saturated Fat - 12g)
Sodium - 1040mg
Carbs - 50g (Sugar - 11g)
Protein - 22g