Carbohydrate is one of the three main nutrients that are a major source of energy. Carbohydrates provide 4 calories one gets from a gram of carbohydrates.
Fibers are one of the carbohydrates that is helpful in digestion and makes an individual feel full. Carbohydrates are a good source of fiber.
Carbohydrates are not able to insulate the body like fats as they are utilized by the body and do not store for a longer time of period like fat.
Since they are listed per serving you can limit your portion sizes and a con is that to know how many nutrients are in your food you would have to add it all up yourself.