If you've never thought about your sitting situation, just think about how many hours a day you sit in the same position, and how that posture could be hurting your lower back, making your head jut forward, and keeping your hips flexed all day long. If I'm going to spend eight or more hours a day in one position, I'd rather be either laying down, like in a bed, or being upright by either sitting in a saddle chair or standing. It's little changes in your lifestyle like this that can make huge differences down the line.
Don't knock it until you tried it!