I don't see it as a value at all.
If we get desert with our CS meal..... we don't get the snack later in the day.
Most of the time we would only get a muffin with juice for breakfast.
At best.... if we ate more than our usual.... we would break even.
But like another poster said..... we change it up and like to do 2 or 3 TS meals in a week. and when we do TS we usually eat very light the rest of the day.....
So it's just a convenience for Disney..... they can speed up the process of people paying.