What comes with the free trial, is more free time ... ultimately. When you sign up, you will be sent a free digital postage meter. That allows you to weigh your mail or package and therefore, get and accurate postage amount. Then all you have to do is print the postage on your computer, and you're done!
Think of how many times you have gone to the post office just to send a package that could have gone in the regular mail, you just didn't know how much postage to put on it. Well, situation solved.
For more info go to http://www.scottsigler.com/stamps-promo-code and http://www.stamps-promo-code.blogspot.com