The great thing about hiring couriers to deliver your stuff is that you can count on them to get your stuff delivered on time. There is a guarantee that they are going to get your stuff delivered on time, or you get your money back. Now, as you know, there is no such guarantee with the mail. It is going to get to where it is going when it gets there. Sometimes that is not good enough for people. They need same day delivery or urgent day delivery. Not everything can just arrive when it arrives. A lot of times, people need people to go out of their way to get things delivered on time. That is what couriers do for you. They get your stuff to where it is going on time!